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Quarterly Financial Information (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
Schedule of Quarterly Financial Information Disclosure [Line Items]
Sales	$ 223,911us-gaap_SalesRevenueGoodsNet	$ 234,783us-gaap_SalesRevenueGoodsNet	$ 207,751us-gaap_SalesRevenueGoodsNet	$ 172,610us-gaap_SalesRevenueGoodsNet	$ 166,742us-gaap_SalesRevenueGoodsNet	$ 176,182us-gaap_SalesRevenueGoodsNet	$ 179,380us-gaap_SalesRevenueGoodsNet	$ 159,786us-gaap_SalesRevenueGoodsNet
Gross profit	48,372us-gaap_GrossProfit	55,440us-gaap_GrossProfit	47,286us-gaap_GrossProfit	38,130us-gaap_GrossProfit	36,351us-gaap_GrossProfit	43,156us-gaap_GrossProfit	44,091us-gaap_GrossProfit	34,912us-gaap_GrossProfit	189,228us-gaap_GrossProfit	158,510us-gaap_GrossProfit	143,512us-gaap_GrossProfit
Net income	$ 11,351us-gaap_NetIncomeLoss	$ 13,367us-gaap_NetIncomeLoss	$ 9,195us-gaap_NetIncomeLoss	$ 7,238us-gaap_NetIncomeLoss	$ 6,024us-gaap_NetIncomeLoss	$ 11,333us-gaap_NetIncomeLoss	$ 11,787us-gaap_NetIncomeLoss	$ 6,950us-gaap_NetIncomeLoss	$ 41,151us-gaap_NetIncomeLoss	$ 36,094us-gaap_NetIncomeLoss	$ 28,903us-gaap_NetIncomeLoss
Per common share - diluted
Diluted (in dollars per share)	$ 1.00us-gaap_EarningsPerShareDiluted	$ 1.10us-gaap_EarningsPerShareDiluted	$ 0.75us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted	$ 0.93us-gaap_EarningsPerShareDiluted	$ 0.97us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 3.42us-gaap_EarningsPerShareDiluted	$ 2.96us-gaap_EarningsPerShareDiluted	$ 2.40us-gaap_EarningsPerShareDiluted
Average shares
Diluted (in shares)	11,403us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,205us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,276us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,270us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,262us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,229us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,200us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,158us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,039us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,212us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,058us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Dividends per share (in dollars per share)	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared	$ 0.28us-gaap_CommonStockDividendsPerShareDeclared	$ 0.28us-gaap_CommonStockDividendsPerShareDeclared	$ 0.24us-gaap_CommonStockDividendsPerShareDeclared
High
Market price of common stock
Share Price (in dollars per share)	$ 52.13us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 55.84us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 57.86us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 60.65us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 61.27us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 49.45us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 44.13us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 40.64us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 52.13us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 61.27us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember
Low
Market price of common stock
Share Price (in dollars per share)	$ 37.93us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 40.75us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 49.50us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 46.87us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 45.51us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 40.48us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 37.39us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 33.12us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 37.93us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 45.51us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MinimumMember

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