Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 120,800us-gaap_SalesRevenueNet	$ 100,645us-gaap_SalesRevenueNet
Cost of sales	72,553us-gaap_CostOfGoodsAndServicesSold	62,478us-gaap_CostOfGoodsAndServicesSold
Gross profit	48,247us-gaap_GrossProfit	38,167us-gaap_GrossProfit
Selling, general and administrative expenses	20,593	18,222
Income from operations	27,654us-gaap_OperatingIncomeLoss	19,945us-gaap_OperatingIncomeLoss
Interest expense, net	137us-gaap_InterestExpense	323us-gaap_InterestExpense
Income before income taxes	27,517	19,622
Provision for income taxes	9,964us-gaap_IncomeTaxExpenseBenefit	7,327us-gaap_IncomeTaxExpenseBenefit
Net income	17,553us-gaap_NetIncomeLoss	12,295us-gaap_NetIncomeLoss
Basic earnings per common share	$ 0.55us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic
Basic weighted average common shares outstanding	31,683,672	33,128,676
Diluted earnings per common share	$ 0.55us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted
Diluted weighted average common shares outstanding	32,094,828	33,599,438
Comprehensive income	$ 17,553us-gaap_ComprehensiveIncomeNetOfTax	$ 12,295us-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 aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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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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Amount of the cost of borrowed funds accounted for as interest expense.

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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