Inventory Disclosure [Abstract] Components of inventories Schedule of Inventory, Current [Table Text Block] Marketable Securities [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Prism Assurance Ltd [Member] Subsidiaries [Member] Statement [Line Items] Statement [Line Items] Marketable Securities (Textual) [Abstract] Marketable Securities (Textual) [Abstract] Marketable securities. Investments, Total Marketable Securities Short-term available for sale securities Available-for-sale Securities, Debt Securities, Current Available-for-sale Securities, Debt Securities, Noncurrent Available-for-sale Securities, Debt Securities, Noncurrent Greater Than or Equal to 12 Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Greater Than or Equal to 12 Months, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss Available-for-sale Securities, Gross Realized Gains Available-for-sale Securities, Gross Realized Gains Income Tax Disclosure [Abstract] Liability for Uncertain Tax Positions, Noncurrent Liability for Uncertain Tax Positions, Noncurrent UnrecognizedTaxBenefitsReductionsResultingFromSettlementsWithTaxingAuthoritiesAndLapseOfApplicableStatuteOfLimitations Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Income Tax Credits and Adjustments Income Tax Credits and Adjustments Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Guarantees and warranties Movement in Extended Product Warranty Accrual [Roll Forward] Balance at beginning of period Extended Product Warranty Accrual Additional accruals Extended Product Warranty Accrual, Warranties Issued Claims paid Extended Product Warranty Accrual, Payments Balance at end of period Goodwill and Intangible Assets Disclosure [Abstract] Schedule of goodwill attributable to each business segment Schedule of Goodwill [Table Text Block] Schedule of finite lived intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of estimated future amortization expense for identifiable intangible assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Inventories Inventory Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Compensation and Retirement Disclosure [Abstract] Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Components of inventories Inventory, Net, Items Net of Reserve Alternative [Abstract] Raw materials Inventory, Raw Materials, Net of Reserves Work-in-process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Costs and earnings in excess of billings on uncompleted contracts Costs in Excess of Billings, Current Total inventories Inventory, Net Fair Value Disclosures [Abstract] Restricted Cash and Cash Equivalents, Noncurrent Restricted Cash and Cash Equivalents, Noncurrent Mutual fund investments Mutual Fund Investments Fair Value Disclosure Mutual fund investments fair value disclosure. Statement of Comprehensive Income [Abstract] Net earnings Net Income (Loss) Attributable to Parent Other comprehensive earnings: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Unrealized gain (loss) on marketable securities, net of $16, $56, $70 and $(95) tax expense (benefit), respectively Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized gain (loss) on foreign currency hedge, net of $-, $184, $(36) and $264 tax expense (benefit), respectively Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Other comprehensive earnings (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total comprehensive earnings Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock [Member] Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Share-based Compensation Cash proceeds from exercise of stock options Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options Aggregate intrinsic value of securities Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Performance shares granted Performance shares granted Additional performance shares granted because the company exceeded target performance. Number of performance share units granted Performance Shares Previously Granted Performance Shares Previously Granted under performance period. Total unrecognized compensation cost related to nonvested share Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Weighted average period, Nonvested Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Total fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Components of net periodic benefit cost Schedule of Net Benefit Costs [Table Text Block] Marketable Securities Marketable Securities [Table Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Receivables, net of allowance for doubtful accounts Accounts Receivable, Net, Current Inventories Refundable income taxes Income Taxes Receivable, Current Deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Current Other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Restricted investments Goodwill Goodwill Intangible assets Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Total assets Assets Liabilities and Shareholders' Equity Liabilities and Equity [Abstract] Current liabilities Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued payroll and related benefits Employee-related Liabilities, Current Accrued self-insurance reserves Self Insurance Reserve, Current Other current liabilities Other Liabilities, Current Billings in excess of costs and earnings on uncompleted contracts Billings in Excess of Cost Current portion long-term debt Long-term Debt, Current Maturities Accrued income taxes Accrued Income Taxes, Current Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Unrecognized tax benefits Long-term self-insurance reserves Self Insurance Reserve, Noncurrent Deferred tax liabilities Deferred Tax Liabilities, Net, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Commitments and contingent liabilities (Note 13) Commitments and Contingencies Shareholders' equity Stockholders' Equity Attributable to Parent [Abstract] Common stock of $0.33-1/3 par value; authorized 50,000,000 shares; issued and outstanding 28,996,209 and 28,958,119, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Common stock held in trust Common Stock Issued, Employee Stock Trust Deferred compensation obligations Deferred Compensation Equity Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders' equity Liabilities and Equity Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] Other Observable Inputs (Level 2) [Member] Fair Value, Inputs, Level 2 [Member] Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Eligible Item or Group for Fair Value Option [Axis] Eligible Item or Group for Fair Value Option [Axis] Fair Value, Option, Eligible Item or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Money market funds [Member] Money Market Funds [Member] Municipal bonds [Member] Municipal Bonds [Member] Mutual funds [Member] Equity Funds [Member] Foreign Exchange Contract [Member] Foreign Exchange Contract [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Financial assets and liabilities measured at fair value Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract] Cash equivalents Cash and Cash Equivalents [Abstract] Total cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Available for sale securities Available-for-sale Securities [Abstract] Available-for-sale Securities Available-for-sale Securities Restricted investments Restricted Investments Note [Abstract] Total restricted investments Restricted Investments, at Fair Value Mutual fund investments Investments, All Other Investments [Abstract] Total mutual fund investments Trading Securities Derivative Instruments and Hedges, Assets [Abstract] Derivative Instruments and Hedges, Assets [Abstract] Foreign Currency Contract, Asset, Fair Value Disclosure Foreign Currency Contract, Asset, Fair Value Disclosure Total assets at fair value Assets, Fair Value Disclosure Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Business Combinations [Abstract] Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Segment Information [Abstract] Segment Information [Abstract] Number of Reportable Segments Number of Reportable Segments Number of Operating Segments Number of Operating Segments Document and Entity Information [Abstract] Abstract for Document and Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Sales and operating income data Schedule of Segment Reporting Information, by Segment [Table Text Block] Business Acquisition, Cost of Acquired Entity, Cash Paid Payments to Acquire Businesses, Gross Cash Acquired from Acquisition Cash Acquired from Acquisition Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Company's backlog bonded by performance bonds Companies Backlog Related to Sales Companies backlog related to sales. Face value of performance bonds Debt Instrument, Face Amount Total value of letter of credit Letters of Credit Outstanding, Amount Purchase obligations Purchase Obligation Line of Credit Facility [Table] Line of Credit Facility [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Schedule Of Goodwill [Table] Schedule of Goodwill [Table] Statement Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Architectural Glass [Member] Architectural [Member] Architectural. Architectural Services segment [Member] Architectural Services segment [Member] Architectural Services segment [Member] Architectural Framing Systems Segment [Member] Architectural Framing Segment [Member] Architectural Framing Segment [Member] Large-Scale Optical [Member] Large Scale Optical [Member] Large scale optical. Goodwill [Line Items] Goodwill [Line Items] Schedule of goodwill attributable to each business segment Goodwill [Roll Forward] Goodwill, Beginning Goodwill, Acquired During Period Goodwill, Acquired During Period Foreign currency translation Goodwill, Translation Adjustments Goodwill, Ending Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types Of Debt And Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types Of Debt And Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Amortized cost, gross unrealized gains and losses, and estimated fair values of investments available for sale Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Gross Unrealized Gain Gross Unrealized Losses Available-for-sale Securities, Gross Unrealized Loss Estimated Market Value, Total Available-for-sale Securities, Debt Securities Fair Value Measurements Fair Value Disclosures [Text Block] Components of net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Interest cost Defined Benefit Plan, Interest Cost Expected return on assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of unrecognized net loss Defined Benefit Plan, Amortization of Gains (Losses) Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Goodwill and Other Identifiable Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Schedule of amortized cost and estimated fair values of investments by contractual maturity Amortized Cost and Estimated Fair Values of Investments [Abstract] Amortized cost and estimated fair values of investments. Amortized Cost, Due within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Amortized Cost, Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Amortized Cost, Due after five years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Amortized Cost, Due after 10 years through 15 years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized Cost, Due beyond 15 years Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Amortized Cost, Total Estimated Market Value, Due within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Estimated Market Value, Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Estimated Market Value, Due after five years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Estimated Market Value, Due after 10 years through 15 years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Estimated Market Value, Due beyond 15 years Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Estimated Market Value, Total Goodwill and Other Identifiable Intangible Assets (Textual) [Abstract] Goodwill and Other Identifiable Intangible Assets (Textual) [Abstract] Goodwill and other identifiable intangible assets. Amortization expense on identifiable intangible assets Amortization of Intangible Assets Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Debt issue costs [Member] Debt Issue Costs [Member] Debt issue costs Noncompete Agreements [Member] Noncompete Agreements [Member] Customer Relationships [Member] Customer Relationships [Member] Trademarks [Member] Trademarks [Member] Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Schedule of finite lived identifiable intangible assets Finite-Lived Intangible Assets, Net [Abstract] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Foreign Currency Translation Finite Lived Identifiable Intangible Assets Translation Adjustments Finite lived identifiable intangible assets translation adjustments. Net Finite-Lived Intangible Assets, Net Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite-lived Intangible Assets, Translation Adjustments Indefinite-lived Intangible Assets, Translation Adjustments Indefinite-lived Intangible Assets (Excluding Goodwill), Net of translation adjustments Indefinite-lived Intangible Assets (Excluding Goodwill), Net of translation adjustments Indefinite-lived Intangible Assets (Excluding Goodwill), Net of translation adjustments Intangible Assets, Gross (Excluding Goodwill) Intangible Assets, Gross (Excluding Goodwill) Intangible Assets Accumulated Amortization Intangible Assets Accumulated Amortization Intangible Assets Accumulated Amortization Intangible Assets Foreign Currency Translation Intangible Assets Foreign Currency Translation Intangible Assets Foreign Currency Translation Intangible Assets, Net (Excluding Goodwill) Income Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Reconciliation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Accounting Changes and Error Corrections [Abstract] New Accounting Standards New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Intersegment eliminations [Member] Intersegment Eliminations [Member] Corporate and other [Member] Corporate and Other [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Sales and operating income data Segment Reporting Information, Profit (Loss) [Abstract] Net sales Revenue, Net Operating income (loss) Operating Income (Loss) Business Combination Disclosure [Text Block] Business Combination Disclosure [Text Block] Award transactions on stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding, Beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding shares awards exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Outstanding shares awards canceled Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Outstanding, Ending Outstanding shares exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Award transactions on stock options, Weighted Average Exercise Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted average exercise price, Beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average exercise price, Awards exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price, Awards canceled Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted average exercise price, Ending Weighted average exercise price, Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted average remaining contractual life, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual life, Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Tax expense (benefit) on marketable securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Tax expense (benefit) on foreign currency hedge Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Earnings Per Share Earnings Per Share [Text Block] Future minimum rental payments under noncancelable operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Total minimum payments, Remainder of Fiscal 2015 Operating Leases, Future Minimum Payments Due, Next Twelve Months Total minimum payments, Fiscal 2016 Operating Leases, Future Minimum Payments, Due in Two Years Total minimum payments, Fiscal 2017 Operating Leases, Future Minimum Payments, Due in Three Years Total minimum payments, Fiscal 2018 Operating Leases, Future Minimum Payments, Due in Four Years Total minimum payments, Fiscal 2019 Operating Leases, Future Minimum Payments, Due in Five Years Total minimum payments, Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Schedule of estimated future amortization expense for identifiable intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Estimated amortization expense, Remainder of Fiscal 2015 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Estimated amortization expense, Fiscal 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two Estimated amortization expense, Fiscal 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three Estimated amortization expense, Fiscal 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four Estimated amortization expense, Fiscal 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Subsequent event - debt [Abstract] Subsequent event - debt [Abstract] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, New Maximum Capacity Line of Credit Facility, New Maximum Capacity Line of Credit Facility, New Maximum Capacity Line of Credit Facility, New Expiration Date Line of Credit Facility, New Expiration Date Line of Credit Facility, New Expiration Date New Debt to Ebitda Ratio New Debt to Ebitda Ratio New Debt to Ebitda Ratio - after amendment 2 to the credit facility Nonvested share award transactions Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Number of shares, Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of shares, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Number of shares, Canceled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested Number, Ending Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Nonvested share award transactions, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted average grant date fair value, Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Canceled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Ending Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Statement of Cash Flows [Abstract] Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net earnings Adjustments to reconcile net earnings to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation Deferred income taxes Deferred Income Tax Expense (Benefit) Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Gain on disposal of assets Gain (Loss) on Disposition of Property Plant Equipment Proceeds from new markets tax credit transaction, net of deferred costs Proceeds from new markets tax credit transaction, net of deferred costs Proceeds from new markets tax credit transaction, net of deferred costs Other, net Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Receivables Increase (Decrease) in Receivables Inventories Increase (Decrease) in Inventories Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Billings in excess of costs and earnings on uncompleted contracts Increase (Decrease) in Billing in Excess of Cost of Earnings Refundable and accrued income taxes Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Proceeds from sales of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Purchases of restricted investments Payments to Acquire Restricted Investments Sales/maturities of restricted investments Proceeds from Sale of Restricted Investments Purchases of marketable securities Payments to Acquire Available-for-sale Securities, Debt Sales/maturities of marketable securities Proceeds from Sale of Available-for-sale Securities, Debt Investments in corporate-owned life insurance policies Payments to Acquire Life Insurance Policies Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of debt Proceeds from Issuance of Long-term Debt Payments on debt Repayments of Long-term Debt Payments on debt issue costs Payments of Debt Issuance Costs Shares withheld for taxes, net of stock issued to employees Shares Withheld For Taxes Net Of Stock Issued To Employees The cash outflow paid by the company to cover an employee's income tax withholding obligation as part of a net-share settlement of a share-based award, net of the total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Repurchase and retirement of common stock Payments for Repurchase of Common Stock Dividends paid Payments of Ordinary Dividends, Common Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Effect of exchange rates on cash Effect of Exchange Rate on Cash and Cash Equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Noncash Activity Noncash Investing and Financing Items [Abstract] Capital expenditures in accounts payable Capital Expenditures Incurred but Not yet Paid Dividends in accounts payable Dividends Payable Future minimum rental payments under noncancelable operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Guarantees and warranties Schedule of Product Warranty Liability [Table Text Block] Income Statement [Abstract] Cost of sales Cost of Goods Sold Gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income Interest income Investment Income, Interest Interest expense Interest Expense Other income (expense), net Other Nonoperating Income (Expense) Earnings before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) Net earnings Earnings per share - basic Earnings Per Share, Basic [Abstract] Net earnings Earnings Per Share, Basic Earnings per share - diluted Earnings Per Share, Diluted [Abstract] Net earnings Earnings Per Share, Diluted Weighted average basic shares outstanding Weighted Average Number of Shares Outstanding, Basic Weighted average diluted shares outstanding Weighted Average Number of Shares Outstanding, Diluted Reconciliation of basic and diluted earnings per share Earnings Per Share, Basic and Diluted [Abstract] Basic earnings per share - weighted common shares outstanding Incremental Common Shares Attributable to Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted Average Number of Shares Outstanding, Diluted Earnings per share - basic Earnings per share - diluted Stock options excluded from the calculation of earnings per share because the exercise price was greater than the average market price of the common shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Award transactions on stock options Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block] Nonvested share award transactions Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Amortized cost, gross unrealized gains and losses, and estimated fair values of investments available for sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of amortized cost and estimated fair values of investments by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Credit Facility [Domain] Credit Facility [Domain] Industrial Revenue Bonds [Member] Recovery Zone Facility Bonds [Member] Recovery zone facility bonds. Notes Payable, Other Payables [Member] Notes Payable, Other Payables [Member] Maximum [Member] Debt (Textual) [Abstract] Debt (Textual) [Abstract] Debt. Line of Credit Facility, Expiration Date Line of Credit Facility, Expiration Date Line of Credit Facility, Amount Outstanding Long-term Line of Credit Debt to Ebitda Ratio Debt to Ebitda Ratio Debt to Ebitda Ratio Minimum net worth required Minimum Net Worth Required for Compliance Net Worth Minimum Net Capital Required for Entity Debt Long-term Debt Interest payments Interest Paid Financial assets and liabilities measured at fair value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Alumicor Limited [Member] Alumicor Limited [Member] Alumicor Limited [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition, Pro Forma Earnings Per Share, Diluted Business Acquisition, Pro Forma Earnings Per Share, Diluted