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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	$ 67,560us-gaap_NetIncomeLoss	$ 63,868us-gaap_NetIncomeLoss	$ 48,846us-gaap_NetIncomeLoss
Other comprehensive income (loss):
Unrealized gain on available-for-sale securities	22,977us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax		963us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification of unrealized gain to a realized gain on available-for-sale securities			(1,557)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Foreign currency translation adjustments	(19,545)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(9,284)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	3,824us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total other comprehensive income (loss):	3,432us-gaap_OtherComprehensiveIncomeLossNetOfTax	(9,284)us-gaap_OtherComprehensiveIncomeLossNetOfTax	3,230us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 70,992us-gaap_ComprehensiveIncomeNetOfTax	$ 54,584us-gaap_ComprehensiveIncomeNetOfTax	$ 52,076us-gaap_ComprehensiveIncomeNetOfTax

X

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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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