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Unaudited 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, 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 Data [Abstract]                      
Net sales $ 317,087us-gaap_SalesRevenueNet $ 354,060us-gaap_SalesRevenueNet $ 344,586us-gaap_SalesRevenueNet $ 279,983us-gaap_SalesRevenueNet $ 305,190us-gaap_SalesRevenueNet $ 328,468us-gaap_SalesRevenueNet $ 314,653us-gaap_SalesRevenueNet $ 248,726us-gaap_SalesRevenueNet $ 1,295,716us-gaap_SalesRevenueNet $ 1,197,037us-gaap_SalesRevenueNet $ 942,398us-gaap_SalesRevenueNet
Gross profit 75,806us-gaap_GrossProfit 84,392us-gaap_GrossProfit 82,214us-gaap_GrossProfit 65,242us-gaap_GrossProfit 73,722us-gaap_GrossProfit 75,381us-gaap_GrossProfit 71,510us-gaap_GrossProfit 53,790us-gaap_GrossProfit 307,654us-gaap_GrossProfit 274,403us-gaap_GrossProfit 214,728us-gaap_GrossProfit
Income (loss) from continuing operations 2,982us-gaap_IncomeLossFromContinuingOperations 4,934us-gaap_IncomeLossFromContinuingOperations 5,480us-gaap_IncomeLossFromContinuingOperations (3,309)us-gaap_IncomeLossFromContinuingOperations 2,897us-gaap_IncomeLossFromContinuingOperations (5,603)us-gaap_IncomeLossFromContinuingOperations 1,884us-gaap_IncomeLossFromContinuingOperations (4,214)us-gaap_IncomeLossFromContinuingOperations 10,087us-gaap_IncomeLossFromContinuingOperations (5,036)us-gaap_IncomeLossFromContinuingOperations (14,582)us-gaap_IncomeLossFromContinuingOperations
Income from discontinued operations, net of tax 124us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 40us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 147us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 21us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 60us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 90us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 94us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 157us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 332us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 401us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 49us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income (loss) $ 3,106us-gaap_NetIncomeLoss $ 4,974us-gaap_NetIncomeLoss $ 5,627us-gaap_NetIncomeLoss $ (3,288)us-gaap_NetIncomeLoss $ 2,957us-gaap_NetIncomeLoss $ (5,513)us-gaap_NetIncomeLoss $ 1,978us-gaap_NetIncomeLoss $ (4,057)us-gaap_NetIncomeLoss $ 10,419us-gaap_NetIncomeLoss $ (4,635)us-gaap_NetIncomeLoss $ (14,533)us-gaap_NetIncomeLoss
Basic income (loss) per share                      
Income (loss) from continuing operations (in dollars per share) $ 0.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.19us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.21us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.30)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.36)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare      
Income from discontinued operations (in dollars per share) $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare      
Net income (loss) per share (in dollars per share) $ 0.12us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ (0.13)us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic $ (0.30)us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ (0.35)us-gaap_EarningsPerShareBasic      
Diluted income (loss) per share                      
Income (loss) from continuing operations (in dollars per share) $ 0.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.19us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.21us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.11us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.30)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.36)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare      
Income from discontinued operations (in dollars per share) $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare      
Net income (loss) per share (in dollars per share) $ 0.12us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted $ (0.13)us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ (0.30)us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ (0.35)us-gaap_EarningsPerShareDiluted      
Basic and diluted income (loss) per share                      
Income (loss) from continuing operations (in dollars per share)                 $ 0.39us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare $ (0.38)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare $ (1.83)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Income from discontinued operations (in dollars per share)                 $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare $ 0.02us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare $ 0.00us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare
Net income (loss) per share (in dollars per share)                 $ 0.40us-gaap_EarningsPerShareBasicAndDiluted $ (0.36)us-gaap_EarningsPerShareBasicAndDiluted $ (1.83)us-gaap_EarningsPerShareBasicAndDiluted