Quarterly Financial Information (Unaudited) (Tables) (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 (Unaudited) [Abstract]
Net sales	$ 161,149us-gaap_SalesRevenueGoodsNet	$ 167,797us-gaap_SalesRevenueGoodsNet	$ 166,832us-gaap_SalesRevenueGoodsNet	$ 111,414us-gaap_SalesRevenueGoodsNet	$ 156,458us-gaap_SalesRevenueGoodsNet	$ 162,248us-gaap_SalesRevenueGoodsNet	$ 149,936us-gaap_SalesRevenueGoodsNet	$ 129,321us-gaap_SalesRevenueGoodsNet	$ 607,192us-gaap_SalesRevenueGoodsNet	$ 597,963us-gaap_SalesRevenueGoodsNet	$ 588,541us-gaap_SalesRevenueGoodsNet
Gross profit	31,605us-gaap_GrossProfit	35,159us-gaap_GrossProfit	30,700us-gaap_GrossProfit	24,127us-gaap_GrossProfit	30,611us-gaap_GrossProfit	31,305us-gaap_GrossProfit	29,175us-gaap_GrossProfit	24,848us-gaap_GrossProfit	121,591us-gaap_GrossProfit	115,939us-gaap_GrossProfit	92,269us-gaap_GrossProfit
Income from continuing operations	6,038	9,119	6,848	3,649	7,275	9,793	7,257	4,951	25,654	29,276	14,764
Income from discontinued operations	(9)	(3)	14	0	0	0	38	(24)	2	14	1,424
Net income	$ 6,029us-gaap_NetIncomeLoss	$ 9,116us-gaap_NetIncomeLoss	$ 6,862us-gaap_NetIncomeLoss	$ 3,649us-gaap_NetIncomeLoss	$ 7,275us-gaap_NetIncomeLoss	$ 9,793us-gaap_NetIncomeLoss	$ 7,295us-gaap_NetIncomeLoss	$ 4,927us-gaap_NetIncomeLoss	$ 25,656us-gaap_NetIncomeLoss	$ 29,290us-gaap_NetIncomeLoss	$ 16,188us-gaap_NetIncomeLoss
Basic earnings per common share: From continuing operations	$ 0.59	$ 0.89	$ 0.67	$ 0.36	$ 0.71	$ 0.96	$ 0.71	$ 0.49	$ 2.51	$ 2.88	$ 1.46
Basic earnings per common share: From discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.14
Basic earnings per common share	$ 0.59us-gaap_EarningsPerShareBasic	$ 0.89us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.71us-gaap_EarningsPerShareBasic	$ 0.96us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 2.51us-gaap_EarningsPerShareBasic	$ 2.88us-gaap_EarningsPerShareBasic	$ 1.60us-gaap_EarningsPerShareBasic
Diluted earnings per common share: From continuing operations	$ 0.58	$ 0.88	$ 0.66	$ 0.35	$ 0.71	$ 0.95	$ 0.71	$ 0.48	$ 2.48	$ 2.85	$ 1.44
Diluted earnings per common share: From discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.14
Diluted earnings per common share	$ 0.58us-gaap_EarningsPerShareDiluted	$ 0.88us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.95us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 2.48us-gaap_EarningsPerShareDiluted	$ 2.85us-gaap_EarningsPerShareDiluted	$ 1.58us-gaap_EarningsPerShareDiluted
Dividends paid per common share	$ 0.04	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.13	$ 0.12	$ 0.10

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

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