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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
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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 | $ 59,419 us-gaap_SalesRevenueNet | $ 52,639 us-gaap_SalesRevenueNet | $ 54,549 us-gaap_SalesRevenueNet | $ 56,504 us-gaap_SalesRevenueNet | $ 55,652 us-gaap_SalesRevenueNet | $ 49,501 us-gaap_SalesRevenueNet | $ 53,811 us-gaap_SalesRevenueNet | $ 57,123 us-gaap_SalesRevenueNet | $ 226,124 us-gaap_SalesRevenueNet | $ 213,074 us-gaap_SalesRevenueNet | $ 198,191 us-gaap_SalesRevenueNet
Gross profit | 18,927 us-gaap_GrossProfit | 14,400 us-gaap_GrossProfit | 15,077 us-gaap_GrossProfit | 17,989 us-gaap_GrossProfit | 18,015 us-gaap_GrossProfit | 14,100 us-gaap_GrossProfit | 16,880 us-gaap_GrossProfit | 18,905 us-gaap_GrossProfit | 70,008 us-gaap_GrossProfit | 64,285 us-gaap_GrossProfit | 61,227 us-gaap_GrossProfit
Net income from continuing operations | 5,367 us-gaap_IncomeLossFromContinuingOperations | 4,232 us-gaap_IncomeLossFromContinuingOperations | 4,565 us-gaap_IncomeLossFromContinuingOperations | 3,883 us-gaap_IncomeLossFromContinuingOperations | 1,631 us-gaap_IncomeLossFromContinuingOperations | 1,908 us-gaap_IncomeLossFromContinuingOperations | 3,576 us-gaap_IncomeLossFromContinuingOperations | 5,404 us-gaap_IncomeLossFromContinuingOperations | 15,446 us-gaap_IncomeLossFromContinuingOperations | 15,120 us-gaap_IncomeLossFromContinuingOperations | 10,317 us-gaap_IncomeLossFromContinuingOperations
Net income (loss) from discontinued operations | 11 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (233)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 431 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (637)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 587 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 3,986 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 568 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (145)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 392 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 4,176 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 1,086 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Preferred stock dividend |  | 0 us-gaap_PreferredStockDividendsIncomeStatementImpact |  |  |  | 0 us-gaap_PreferredStockDividendsIncomeStatementImpact | 0 us-gaap_PreferredStockDividendsIncomeStatementImpact | (4)us-gaap_PreferredStockDividendsIncomeStatementImpact | 0 us-gaap_PreferredStockDividendsIncomeStatementImpact | (4)us-gaap_PreferredStockDividendsIncomeStatementImpact | (14)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income | $ 5,378 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,999 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,996 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,246 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,218 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,894 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,144 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,255 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 15,838 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 19,292 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,389 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per common share: | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.22 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.86 us-gaap_EarningsPerShareBasic | $ 1.06 us-gaap_EarningsPerShareBasic | $ 0.63 us-gaap_EarningsPerShareBasic
Diluted earnings per common share: (a) | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.22 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.32 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.85 us-gaap_EarningsPerShareDiluted | $ 1.00 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted

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