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CONSOLIDATED STATEMENT 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	$ 145,832us-gaap_NetIncomeLoss	$ 64,295us-gaap_NetIncomeLoss	$ 58,691us-gaap_NetIncomeLoss
Net change in cumulative translation adjustment	(196)	62	129
Change in unrealized gains (losses) on available-for sale securities, net of tax	(238)	29	28
Other comprehensive income (loss)	(434)	91	157
Comprehensive income (loss)	$ 145,398us-gaap_ComprehensiveIncomeNetOfTax	$ 64,386us-gaap_ComprehensiveIncomeNetOfTax	$ 58,848us-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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