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Condensed Consolidated Statements of Earnings (unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Consolidated Statements of Earnings (unaudited) [Abstract]    
Net sales $ 144,862us-gaap_Revenues $ 85,995us-gaap_Revenues
Cost of sales 101,732us-gaap_CostOfRevenue 62,780us-gaap_CostOfRevenue
Gross margin 43,130us-gaap_GrossProfit 23,215us-gaap_GrossProfit
Operating expenses:    
Selling expenses 11,786us-gaap_SellingExpense 4,189us-gaap_SellingExpense
Research and development expenses 1,448us-gaap_ResearchAndDevelopmentExpense 773us-gaap_ResearchAndDevelopmentExpense
General and administrative expenses 4,858us-gaap_GeneralAndAdministrativeExpense 4,898us-gaap_GeneralAndAdministrativeExpense
Operating expenses 18,092us-gaap_OperatingExpenses 9,860us-gaap_OperatingExpenses
Earnings from operations 25,038us-gaap_OperatingIncomeLoss 13,355us-gaap_OperatingIncomeLoss
Other expenses (income):    
Interest income (2)us-gaap_InvestmentIncomeInterest (46)us-gaap_InvestmentIncomeInterest
Interest expense 1,881us-gaap_InterestExpense 1us-gaap_InterestExpense
Other, net 74us-gaap_OtherNonoperatingIncomeExpense 28us-gaap_OtherNonoperatingIncomeExpense
Earnings before income tax expense 23,085us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 13,372us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense 7,913us-gaap_IncomeTaxExpenseBenefit 4,478us-gaap_IncomeTaxExpenseBenefit
Net earnings $ 15,172us-gaap_NetIncomeLoss $ 8,894us-gaap_NetIncomeLoss
Net earnings per common share - basic (in dollars per share) $ 0.49us-gaap_EarningsPerShareBasic $ 0.30us-gaap_EarningsPerShareBasic
Net earnings per common share - diluted (in dollars per share) $ 0.48us-gaap_EarningsPerShareDiluted $ 0.29us-gaap_EarningsPerShareDiluted