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Operations and Summary of Significant Accounting Policies - Revisions and Out of Period Adjustments (Details) (USD $)	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
Deferred tax asset, current	$ 14,662,000us-gaap_DeferredTaxAssetsNetCurrent				$ 15,611,000us-gaap_DeferredTaxAssetsNetCurrent				$ 14,662,000us-gaap_DeferredTaxAssetsNetCurrent	$ 15,611,000us-gaap_DeferredTaxAssetsNetCurrent
Gross profit	72,797,000us-gaap_GrossProfit	95,553,000us-gaap_GrossProfit	95,900,000us-gaap_GrossProfit	77,780,000us-gaap_GrossProfit	69,744,000us-gaap_GrossProfit	89,895,000us-gaap_GrossProfit	89,172,000us-gaap_GrossProfit	64,720,000us-gaap_GrossProfit	342,030,000us-gaap_GrossProfit	313,531,000us-gaap_GrossProfit	282,472,000us-gaap_GrossProfit
Income from operations	15,320,000us-gaap_OperatingIncomeLoss	32,218,000us-gaap_OperatingIncomeLoss	32,133,000us-gaap_OperatingIncomeLoss	19,605,000us-gaap_OperatingIncomeLoss	11,902,000us-gaap_OperatingIncomeLoss	30,885,000us-gaap_OperatingIncomeLoss	29,678,000us-gaap_OperatingIncomeLoss	9,013,000us-gaap_OperatingIncomeLoss	99,276,000us-gaap_OperatingIncomeLoss	81,478,000us-gaap_OperatingIncomeLoss	61,709,000us-gaap_OperatingIncomeLoss
Restatement Adjustment
Deferred tax asset, current					2,900,000					2,900,000
Gross profit				2,300,000
Income from operations				2,000,000
Net income				$ 1,300,000

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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