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Quarterly Results Quarterly Financial Data (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 Disclosure [Abstract]
Revenues	$ 53,829us-gaap_Revenues	$ 46,719us-gaap_Revenues	$ 44,368us-gaap_Revenues	$ 40,913us-gaap_Revenues	$ 38,871us-gaap_Revenues	$ 36,813us-gaap_Revenues	$ 35,527us-gaap_Revenues	$ 33,626us-gaap_Revenues	$ 185,829us-gaap_Revenues	$ 144,837us-gaap_Revenues	$ 117,791us-gaap_Revenues
Gross Profit	39,319us-gaap_GrossProfit	32,442us-gaap_GrossProfit	29,615us-gaap_GrossProfit	26,367us-gaap_GrossProfit	28,101us-gaap_GrossProfit	25,787us-gaap_GrossProfit	24,741us-gaap_GrossProfit	23,073us-gaap_GrossProfit	127,743us-gaap_GrossProfit	101,702us-gaap_GrossProfit	84,006us-gaap_GrossProfit
Operating Income (Loss)	(2,316)us-gaap_OperatingIncomeLoss	(3,720)us-gaap_OperatingIncomeLoss	(7,871)us-gaap_OperatingIncomeLoss	(8,500)us-gaap_OperatingIncomeLoss	409us-gaap_OperatingIncomeLoss	1,395us-gaap_OperatingIncomeLoss	780us-gaap_OperatingIncomeLoss	689us-gaap_OperatingIncomeLoss	(22,407)us-gaap_OperatingIncomeLoss	3,538us-gaap_OperatingIncomeLoss	8,180us-gaap_OperatingIncomeLoss
Net Income (Loss) Attributable to Parent	$ (17,459)us-gaap_NetIncomeLoss	$ (3,734)us-gaap_NetIncomeLoss	$ (6,996)us-gaap_NetIncomeLoss	$ (8,455)us-gaap_NetIncomeLoss	$ 139us-gaap_NetIncomeLoss	$ 993us-gaap_NetIncomeLoss	$ 580us-gaap_NetIncomeLoss	$ 1,734us-gaap_NetIncomeLoss	$ (36,644)us-gaap_NetIncomeLoss	$ 3,446us-gaap_NetIncomeLoss	$ 4,966us-gaap_NetIncomeLoss
Basic earnings per share	$ (0.60)us-gaap_EarningsPerShareBasic	$ (0.13)us-gaap_EarningsPerShareBasic	$ (0.24)us-gaap_EarningsPerShareBasic	$ (0.29)us-gaap_EarningsPerShareBasic	$ 0.00us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ (1.27)us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic
Diluted	$ (0.60)us-gaap_EarningsPerShareDiluted	$ (0.13)us-gaap_EarningsPerShareDiluted	$ (0.24)us-gaap_EarningsPerShareDiluted	$ (0.29)us-gaap_EarningsPerShareDiluted	$ 0.00us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ (1.27)us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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