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Quarterly Financial Information (Unaudited) (Tables) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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 (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 161,149 us-gaap_SalesRevenueGoodsNet | $ 167,797 us-gaap_SalesRevenueGoodsNet | $ 166,832 us-gaap_SalesRevenueGoodsNet | $ 111,414 us-gaap_SalesRevenueGoodsNet | $ 156,458 us-gaap_SalesRevenueGoodsNet | $ 162,248 us-gaap_SalesRevenueGoodsNet | $ 149,936 us-gaap_SalesRevenueGoodsNet | $ 129,321 us-gaap_SalesRevenueGoodsNet | $ 607,192 us-gaap_SalesRevenueGoodsNet | $ 597,963 us-gaap_SalesRevenueGoodsNet | $ 588,541 us-gaap_SalesRevenueGoodsNet
Gross profit | 31,605 us-gaap_GrossProfit | 35,159 us-gaap_GrossProfit | 30,700 us-gaap_GrossProfit | 24,127 us-gaap_GrossProfit | 30,611 us-gaap_GrossProfit | 31,305 us-gaap_GrossProfit | 29,175 us-gaap_GrossProfit | 24,848 us-gaap_GrossProfit | 121,591 us-gaap_GrossProfit | 115,939 us-gaap_GrossProfit | 92,269 us-gaap_GrossProfit
Income from continuing operations | 6,038 us-gaap_IncomeLossFromContinuingOperations | 9,119 us-gaap_IncomeLossFromContinuingOperations | 6,848 us-gaap_IncomeLossFromContinuingOperations | 3,649 us-gaap_IncomeLossFromContinuingOperations | 7,275 us-gaap_IncomeLossFromContinuingOperations | 9,793 us-gaap_IncomeLossFromContinuingOperations | 7,257 us-gaap_IncomeLossFromContinuingOperations | 4,951 us-gaap_IncomeLossFromContinuingOperations | 25,654 us-gaap_IncomeLossFromContinuingOperations | 29,276 us-gaap_IncomeLossFromContinuingOperations | 14,764 us-gaap_IncomeLossFromContinuingOperations
Income from discontinued operations | (9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (3)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 14 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 38 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (24)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 2 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 14 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,424 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income | $ 6,029 us-gaap_NetIncomeLoss | $ 9,116 us-gaap_NetIncomeLoss | $ 6,862 us-gaap_NetIncomeLoss | $ 3,649 us-gaap_NetIncomeLoss | $ 7,275 us-gaap_NetIncomeLoss | $ 9,793 us-gaap_NetIncomeLoss | $ 7,295 us-gaap_NetIncomeLoss | $ 4,927 us-gaap_NetIncomeLoss | $ 25,656 us-gaap_NetIncomeLoss | $ 29,290 us-gaap_NetIncomeLoss | $ 16,188 us-gaap_NetIncomeLoss
Basic earnings per common share: From continuing operations | $ 0.59 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.89 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.67 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.36 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.71 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.96 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.71 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.49 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.51 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.88 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.46 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic earnings per common share: From discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.14 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic earnings per common share | $ 0.59 us-gaap_EarningsPerShareBasic | $ 0.89 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.71 us-gaap_EarningsPerShareBasic | $ 0.96 us-gaap_EarningsPerShareBasic | $ 0.72 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 2.51 us-gaap_EarningsPerShareBasic | $ 2.88 us-gaap_EarningsPerShareBasic | $ 1.60 us-gaap_EarningsPerShareBasic
Diluted earnings per common share: From continuing operations | $ 0.58 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.88 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.66 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.71 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.95 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.71 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.48 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.48 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.85 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.44 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted earnings per common share: From discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.14 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted earnings per common share | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 0.88 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.71 us-gaap_EarningsPerShareDiluted | $ 0.95 us-gaap_EarningsPerShareDiluted | $ 0.71 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 2.48 us-gaap_EarningsPerShareDiluted | $ 2.85 us-gaap_EarningsPerShareDiluted | $ 1.58 us-gaap_EarningsPerShareDiluted
Dividends paid per common share | $ 0.04 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.03 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.03 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.03 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.03 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.03 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.03 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.03 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.12 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration