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Acquisitions - Pro Forma Consolidated Results (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
Business Combinations [Abstract]
Revenues	$ 132,780us-gaap_SalesRevenueGoodsNet	$ 128,808us-gaap_SalesRevenueGoodsNet	$ 128,865us-gaap_SalesRevenueGoodsNet	$ 119,236us-gaap_SalesRevenueGoodsNet	$ 120,016us-gaap_SalesRevenueGoodsNet	$ 115,210us-gaap_SalesRevenueGoodsNet	$ 109,875us-gaap_SalesRevenueGoodsNet	$ 103,948us-gaap_SalesRevenueGoodsNet	$ 509,689us-gaap_SalesRevenueGoodsNet	$ 449,049us-gaap_SalesRevenueGoodsNet	$ 394,288us-gaap_SalesRevenueGoodsNet
Sales, Pro Forma										454,333	438,981
Net income									22,974us-gaap_ProfitLoss	16,570us-gaap_ProfitLoss	19,710us-gaap_ProfitLoss
Net income, Pro Forma										$ 17,112	$ 25,075
EARNINGS PER COMMON SHARE:
Earnings per common share: basic (in dollars per share)	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic
Earnings per common share: basic, Pro Forma (in dollars per share)										$ 0.40	$ 0.59
Earnings per common share: diluted (in dollars per share)	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.13us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.53us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted
Earnings per common share: diluted, Pro Forma (in dollars per share)										$ 0.40	$ 0.59