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Consolidated Statements Of Comprehensive Income (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements Of Comprehensive Income [Abstract]      
Net sales $ 412,363,000us-gaap_SalesRevenueNet $ 420,188,000us-gaap_SalesRevenueNet $ 472,490,000us-gaap_SalesRevenueNet
Cost of sales 335,162,000us-gaap_CostOfGoodsAndServicesSold 340,836,000us-gaap_CostOfGoodsAndServicesSold 377,627,000us-gaap_CostOfGoodsAndServicesSold
Gross profit 77,201,000us-gaap_GrossProfit 79,352,000us-gaap_GrossProfit 94,863,000us-gaap_GrossProfit
Selling and general expenses 23,216,000us-gaap_SellingGeneralAndAdministrativeExpense 21,231,000us-gaap_SellingGeneralAndAdministrativeExpense 34,095,000us-gaap_SellingGeneralAndAdministrativeExpense
Intangibles amortization 11,991,000us-gaap_AmortizationOfIntangibleAssets 667,000us-gaap_AmortizationOfIntangibleAssets 1,049,000us-gaap_AmortizationOfIntangibleAssets
Impairment of finite lived intangible assets 2,063,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived    
Goodwill impairment 0us-gaap_GoodwillImpairmentLoss 2,840,000us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Change in contingent consideration liability   (3,000,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1  
Operating profit 39,931,000us-gaap_OperatingIncomeLoss 57,614,000us-gaap_OperatingIncomeLoss 59,719,000us-gaap_OperatingIncomeLoss
Other income, principally interest 366,000us-gaap_OtherNonoperatingIncomeExpense 731,000us-gaap_OtherNonoperatingIncomeExpense 705,000us-gaap_OtherNonoperatingIncomeExpense
Earnings before provision for income taxes 40,297,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 58,345,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 60,424,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 13,820,000us-gaap_IncomeTaxExpenseBenefit 17,093,000us-gaap_IncomeTaxExpenseBenefit 21,549,000us-gaap_IncomeTaxExpenseBenefit
Net earnings 26,477,000us-gaap_NetIncomeLoss 41,252,000us-gaap_NetIncomeLoss 38,875,000us-gaap_NetIncomeLoss
Weighted average common shares outstanding:      
Weighted average shares outstanding (basic and diluted) 6,930us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 6,907us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 6,889us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net Earnings per Share      
Basic and diluted $ 3.82us-gaap_EarningsPerShareBasicAndDiluted $ 5.97us-gaap_EarningsPerShareBasicAndDiluted $ 5.64us-gaap_EarningsPerShareBasicAndDiluted
Other comprehensive income loss, net of tax:      
Unrealized loss on available-for-sale securities 11,000us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 45,000us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 19,000us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Comprehensive income $ 26,466,000us-gaap_ComprehensiveIncomeNetOfTax $ 41,207,000us-gaap_ComprehensiveIncomeNetOfTax $ 38,856,000us-gaap_ComprehensiveIncomeNetOfTax