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Quarterly Results of Operations (Unaudited) (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 Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 132,780 us-gaap_SalesRevenueGoodsNet | $ 128,808 us-gaap_SalesRevenueGoodsNet | $ 128,865 us-gaap_SalesRevenueGoodsNet | $ 119,236 us-gaap_SalesRevenueGoodsNet | $ 120,016 us-gaap_SalesRevenueGoodsNet | $ 115,210 us-gaap_SalesRevenueGoodsNet | $ 109,875 us-gaap_SalesRevenueGoodsNet | $ 103,948 us-gaap_SalesRevenueGoodsNet | $ 509,689 us-gaap_SalesRevenueGoodsNet | $ 449,049 us-gaap_SalesRevenueGoodsNet | $ 394,288 us-gaap_SalesRevenueGoodsNet
Gross profit | 60,134 us-gaap_GrossProfit | 57,421 us-gaap_GrossProfit | 55,624 us-gaap_GrossProfit | 52,043 us-gaap_GrossProfit | 53,359 us-gaap_GrossProfit | 51,030 us-gaap_GrossProfit | 46,985 us-gaap_GrossProfit | 42,993 us-gaap_GrossProfit | 225,222 us-gaap_GrossProfit | 194,367 us-gaap_GrossProfit | 181,992 us-gaap_GrossProfit
Income from operations | 14,217 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 12,076 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,384 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,489 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 10,916 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 8,391 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,780 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,757 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 31,572 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 19,839 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 27,618 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | 3,680 us-gaap_IncomeTaxExpenseBenefit | 2,489 us-gaap_IncomeTaxExpenseBenefit | 1,366 us-gaap_IncomeTaxExpenseBenefit | 1,063 us-gaap_IncomeTaxExpenseBenefit | 1,642 us-gaap_IncomeTaxExpenseBenefit | 833 us-gaap_IncomeTaxExpenseBenefit | 1,253 us-gaap_IncomeTaxExpenseBenefit | (459)us-gaap_IncomeTaxExpenseBenefit | 8,598 us-gaap_IncomeTaxExpenseBenefit | 3,269 us-gaap_IncomeTaxExpenseBenefit | 7,908 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 8,671 us-gaap_NetIncomeLoss | $ 7,764 us-gaap_NetIncomeLoss | $ 3,716 us-gaap_NetIncomeLoss | $ 2,823 us-gaap_NetIncomeLoss | $ 6,540 us-gaap_NetIncomeLoss | $ 5,607 us-gaap_NetIncomeLoss | $ 3,752 us-gaap_NetIncomeLoss | $ 671 us-gaap_NetIncomeLoss |  |  |
Basic (in dollars per share) | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ 0.15 us-gaap_EarningsPerShareBasic | $ 0.13 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.47 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 0.18 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.07 us-gaap_EarningsPerShareDiluted | $ 0.15 us-gaap_EarningsPerShareDiluted | $ 0.13 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.46 us-gaap_EarningsPerShareDiluted

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