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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 53,603us-gaap_NetIncomeLoss	$ 36,178us-gaap_NetIncomeLoss	$ 49,791us-gaap_NetIncomeLoss
Other comprehensive income (loss):
Foreign currency translation adjustment	(143)	(319)	4
Comprehensive income	$ 53,460us-gaap_ComprehensiveIncomeNetOfTax	$ 35,859us-gaap_ComprehensiveIncomeNetOfTax	$ 49,795us-gaap_ComprehensiveIncomeNetOfTax

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

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- Definition

Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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