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Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 76,768us-gaap_SalesRevenueGoodsNet	$ 76,367us-gaap_SalesRevenueGoodsNet
Cost of sales	54,970us-gaap_CostOfGoodsSold	54,521us-gaap_CostOfGoodsSold
Gross profit	21,798us-gaap_GrossProfit	21,846us-gaap_GrossProfit
Selling, general and administrative expenses	8,317us-gaap_SellingGeneralAndAdministrativeExpense	7,629us-gaap_SellingGeneralAndAdministrativeExpense
Loss (gain) on disposal of assets	5us-gaap_GainLossOnDispositionOfAssets	(24)us-gaap_GainLossOnDispositionOfAssets
Income from operations	13,476us-gaap_OperatingIncomeLoss	14,241us-gaap_OperatingIncomeLoss
Interest income, net	44us-gaap_InvestmentIncomeInterest	69us-gaap_InvestmentIncomeInterest
Other expense, net	(75)us-gaap_OtherNonoperatingIncomeExpense	(21)us-gaap_OtherNonoperatingIncomeExpense
Income before taxes	13,445us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	14,289us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision	5,046us-gaap_IncomeTaxExpenseBenefit	4,467us-gaap_IncomeTaxExpenseBenefit
Net income	$ 8,399us-gaap_NetIncomeLoss	$ 9,822us-gaap_NetIncomeLoss
Earnings per share:
Basic (usd per share)	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic
Diluted (usd per share)	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted
Cash dividends declared per common share	$ 0us-gaap_CommonStockDividendsPerShareDeclared	$ 0us-gaap_CommonStockDividendsPerShareDeclared
Weighted average shares outstanding:
Basic (in shares)	54,083,897us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	55,041,831us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	54,640,389us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	55,613,190us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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Aggregate dividends declared during the period for each share of common stock outstanding.

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