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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 166,630 us-gaap_SalesRevenueNet | $ 209,320 us-gaap_SalesRevenueNet | $ 207,893 us-gaap_SalesRevenueNet | $ 168,305 us-gaap_SalesRevenueNet | $ 160,074 us-gaap_SalesRevenueNet | $ 195,619 us-gaap_SalesRevenueNet | $ 195,348 us-gaap_SalesRevenueNet | $ 154,281 us-gaap_SalesRevenueNet | $ 752,148 us-gaap_SalesRevenueNet | $ 705,322 us-gaap_SalesRevenueNet | $ 656,231 us-gaap_SalesRevenueNet
Cost of sales | 93,833 us-gaap_CostOfGoodsSold | 113,767 us-gaap_CostOfGoodsSold | 111,993 us-gaap_CostOfGoodsSold | 90,525 us-gaap_CostOfGoodsSold | 90,330 us-gaap_CostOfGoodsSold | 105,724 us-gaap_CostOfGoodsSold | 106,176 us-gaap_CostOfGoodsSold | 89,561 us-gaap_CostOfGoodsSold | 410,118 us-gaap_CostOfGoodsSold | 391,791 us-gaap_CostOfGoodsSold | 373,759 us-gaap_CostOfGoodsSold
Gross profit | 72,797 us-gaap_GrossProfit | 95,553 us-gaap_GrossProfit | 95,900 us-gaap_GrossProfit | 77,780 us-gaap_GrossProfit | 69,744 us-gaap_GrossProfit | 89,895 us-gaap_GrossProfit | 89,172 us-gaap_GrossProfit | 64,720 us-gaap_GrossProfit | 342,030 us-gaap_GrossProfit | 313,531 us-gaap_GrossProfit | 282,472 us-gaap_GrossProfit
Research and development and other engineering | 9,513 ssd_ResearchAndDevelopmentAndOtherEngineering | 9,711 ssd_ResearchAndDevelopmentAndOtherEngineering | 10,094 ssd_ResearchAndDevelopmentAndOtherEngineering | 9,700 ssd_ResearchAndDevelopmentAndOtherEngineering | 9,825 ssd_ResearchAndDevelopmentAndOtherEngineering | 9,226 ssd_ResearchAndDevelopmentAndOtherEngineering | 9,484 ssd_ResearchAndDevelopmentAndOtherEngineering | 8,308 ssd_ResearchAndDevelopmentAndOtherEngineering | 39,018 ssd_ResearchAndDevelopmentAndOtherEngineering | 36,843 ssd_ResearchAndDevelopmentAndOtherEngineering | 35,919 ssd_ResearchAndDevelopmentAndOtherEngineering
Selling | 22,407 us-gaap_SellingAndMarketingExpense | 23,592 us-gaap_SellingAndMarketingExpense | 24,213 us-gaap_SellingAndMarketingExpense | 21,819 us-gaap_SellingAndMarketingExpense | 21,449 us-gaap_SellingAndMarketingExpense | 20,630 us-gaap_SellingAndMarketingExpense | 21,652 us-gaap_SellingAndMarketingExpense | 21,371 us-gaap_SellingAndMarketingExpense | 92,031 us-gaap_SellingAndMarketingExpense | 85,102 us-gaap_SellingAndMarketingExpense | 82,364 us-gaap_SellingAndMarketingExpense
General and administrative | 25,508 us-gaap_GeneralAndAdministrativeExpense | 29,557 us-gaap_GeneralAndAdministrativeExpense | 29,494 us-gaap_GeneralAndAdministrativeExpense | 26,941 us-gaap_GeneralAndAdministrativeExpense | 25,164 us-gaap_GeneralAndAdministrativeExpense | 28,523 us-gaap_GeneralAndAdministrativeExpense | 28,347 us-gaap_GeneralAndAdministrativeExpense | 26,036 us-gaap_GeneralAndAdministrativeExpense | 111,500 us-gaap_GeneralAndAdministrativeExpense | 108,070 us-gaap_GeneralAndAdministrativeExpense | 99,968 us-gaap_GeneralAndAdministrativeExpense
Impairment of goodwill | 38 us-gaap_GoodwillImpairmentLoss | 492 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 530 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 2,346 us-gaap_GoodwillImpairmentLoss
Gain (loss) on sale of assets | 11 us-gaap_GainLossOnDispositionOfAssets | (17)us-gaap_GainLossOnDispositionOfAssets | (34)us-gaap_GainLossOnDispositionOfAssets | (285)us-gaap_GainLossOnDispositionOfAssets | 1,404 us-gaap_GainLossOnDispositionOfAssets | 631 us-gaap_GainLossOnDispositionOfAssets | 11 us-gaap_GainLossOnDispositionOfAssets | (8)us-gaap_GainLossOnDispositionOfAssets | (325)us-gaap_GainLossOnDispositionOfAssets | 2,038 us-gaap_GainLossOnDispositionOfAssets | 166 us-gaap_GainLossOnDispositionOfAssets
Income from operations | 15,320 us-gaap_OperatingIncomeLoss | 32,218 us-gaap_OperatingIncomeLoss | 32,133 us-gaap_OperatingIncomeLoss | 19,605 us-gaap_OperatingIncomeLoss | 11,902 us-gaap_OperatingIncomeLoss | 30,885 us-gaap_OperatingIncomeLoss | 29,678 us-gaap_OperatingIncomeLoss | 9,013 us-gaap_OperatingIncomeLoss | 99,276 us-gaap_OperatingIncomeLoss | 81,478 us-gaap_OperatingIncomeLoss | 61,709 us-gaap_OperatingIncomeLoss
Interest income, net | 2 us-gaap_InterestRevenueExpenseNet | (27)us-gaap_InterestRevenueExpenseNet | (15)us-gaap_InterestRevenueExpenseNet | 86 us-gaap_InterestRevenueExpenseNet | 56 us-gaap_InterestRevenueExpenseNet | (9)us-gaap_InterestRevenueExpenseNet | 1 us-gaap_InterestRevenueExpenseNet | 38 us-gaap_InterestRevenueExpenseNet |  |  |
Income before taxes | 15,322 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 32,191 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 32,118 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 19,691 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 11,958 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 30,876 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 29,679 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 9,051 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 99,322 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 81,564 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 61,921 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for (benefit from) income taxes | 4,942 us-gaap_IncomeTaxExpenseBenefit | 11,577 us-gaap_IncomeTaxExpenseBenefit | 11,667 us-gaap_IncomeTaxExpenseBenefit | 7,605 us-gaap_IncomeTaxExpenseBenefit | 4,290 us-gaap_IncomeTaxExpenseBenefit | 10,870 us-gaap_IncomeTaxExpenseBenefit | 11,177 us-gaap_IncomeTaxExpenseBenefit | 4,256 us-gaap_IncomeTaxExpenseBenefit | 35,791 us-gaap_IncomeTaxExpenseBenefit | 30,593 us-gaap_IncomeTaxExpenseBenefit | 20,003 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 10,380 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 20,614 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 20,451 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 12,086 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 7,668 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 20,006 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 18,502 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,795 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 63,531 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 50,971 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 41,918 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.21 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.25 us-gaap_EarningsPerShareBasic | $ 0.16 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ 0.10 us-gaap_EarningsPerShareBasic | $ 1.30 us-gaap_EarningsPerShareBasic | $ 1.05 us-gaap_EarningsPerShareBasic | $ 0.87 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.10 us-gaap_EarningsPerShareDiluted | $ 1.29 us-gaap_EarningsPerShareDiluted | $ 1.05 us-gaap_EarningsPerShareDiluted | $ 0.87 us-gaap_EarningsPerShareDiluted
Cash dividends declared per common share (in dollars per share) | $ 0.14 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.140 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.140 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.125 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.125 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.125 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.125 us-gaap_CommonStockDividendsPerShareDeclared | $ 0 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.545 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.625 us-gaap_CommonStockDividendsPerShareDeclared

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use; (3) to conduct internal product testing; (4) or to provide engineering support to customers in the form of testing services or product uses, specifications or requirements. + References No definition available. + Details
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