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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 59,419us-gaap_SalesRevenueNet	$ 52,639us-gaap_SalesRevenueNet	$ 54,549us-gaap_SalesRevenueNet	$ 56,504us-gaap_SalesRevenueNet	$ 55,652us-gaap_SalesRevenueNet	$ 49,501us-gaap_SalesRevenueNet	$ 53,811us-gaap_SalesRevenueNet	$ 57,123us-gaap_SalesRevenueNet	$ 226,124us-gaap_SalesRevenueNet	$ 213,074us-gaap_SalesRevenueNet	$ 198,191us-gaap_SalesRevenueNet
Gross profit	18,927us-gaap_GrossProfit	14,400us-gaap_GrossProfit	15,077us-gaap_GrossProfit	17,989us-gaap_GrossProfit	18,015us-gaap_GrossProfit	14,100us-gaap_GrossProfit	16,880us-gaap_GrossProfit	18,905us-gaap_GrossProfit	70,008us-gaap_GrossProfit	64,285us-gaap_GrossProfit	61,227us-gaap_GrossProfit
Net income from continuing operations	5,367us-gaap_IncomeLossFromContinuingOperations	4,232us-gaap_IncomeLossFromContinuingOperations	4,565us-gaap_IncomeLossFromContinuingOperations	3,883us-gaap_IncomeLossFromContinuingOperations	1,631us-gaap_IncomeLossFromContinuingOperations	1,908us-gaap_IncomeLossFromContinuingOperations	3,576us-gaap_IncomeLossFromContinuingOperations	5,404us-gaap_IncomeLossFromContinuingOperations	15,446us-gaap_IncomeLossFromContinuingOperations	15,120us-gaap_IncomeLossFromContinuingOperations	10,317us-gaap_IncomeLossFromContinuingOperations
Net income (loss) from discontinued operations	11us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(233)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	431us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(637)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	587us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	3,986us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	568us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(145)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	392us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	4,176us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1,086us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Preferred stock dividend		0us-gaap_PreferredStockDividendsIncomeStatementImpact				0us-gaap_PreferredStockDividendsIncomeStatementImpact	0us-gaap_PreferredStockDividendsIncomeStatementImpact	(4)us-gaap_PreferredStockDividendsIncomeStatementImpact	0us-gaap_PreferredStockDividendsIncomeStatementImpact	(4)us-gaap_PreferredStockDividendsIncomeStatementImpact	(14)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income	$ 5,378us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,999us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,996us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,246us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,218us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 5,894us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,144us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 5,255us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 15,838us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 19,292us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 11,389us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per common share:	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.22us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.86us-gaap_EarningsPerShareBasic	$ 1.06us-gaap_EarningsPerShareBasic	$ 0.63us-gaap_EarningsPerShareBasic
Diluted earnings per common share: (a)	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.85us-gaap_EarningsPerShareDiluted	$ 1.00us-gaap_EarningsPerShareDiluted	$ 0.63us-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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