Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 391,660us-gaap_SalesRevenueNet	$ 342,511us-gaap_SalesRevenueNet	$ 307,354us-gaap_SalesRevenueNet
Cost of sales	251,464us-gaap_CostOfGoodsAndServicesSold	243,893us-gaap_CostOfGoodsAndServicesSold	222,772us-gaap_CostOfGoodsAndServicesSold
Gross profit	140,196us-gaap_GrossProfit	98,618us-gaap_GrossProfit	84,582us-gaap_GrossProfit
Selling, general and administrative expenses	72,370	73,967	71,907
Income from operations	67,826us-gaap_OperatingIncomeLoss	24,651us-gaap_OperatingIncomeLoss	12,675us-gaap_OperatingIncomeLoss
Interest expense, net	878us-gaap_InterestExpense	602us-gaap_InterestExpense	8,946us-gaap_InterestExpense
Income before income taxes	66,948	24,049	3,729
Provision (benefit) for income taxes	25,427us-gaap_IncomeTaxExpenseBenefit	(10,549)us-gaap_IncomeTaxExpenseBenefit	1,009us-gaap_IncomeTaxExpenseBenefit
Net income	41,521us-gaap_NetIncomeLoss	34,598us-gaap_NetIncomeLoss	2,720us-gaap_NetIncomeLoss
Basic earnings per common share	$ 1.28us-gaap_EarningsPerShareBasic	$ 1.03us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic
Basic weighted average common shares outstanding	32,319,649	33,589,682	32,247,184
Diluted earnings per common share	$ 1.27us-gaap_EarningsPerShareDiluted	$ 1.01us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted
Diluted weighted average common shares outstanding	32,751,074	34,273,502	34,129,712
Comprehensive income	$ 41,521us-gaap_ComprehensiveIncomeNetOfTax	$ 34,598us-gaap_ComprehensiveIncomeNetOfTax	$ 2,720us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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