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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 88,737	$ 77,497
Other comprehensive gain, net of tax:
Foreign currency translation adjustments	2,488	2,429
Unrealized (loss) gain on investments:
Unrealized (losses) gains during the period, net of income taxes of $19 and $(191)	(24)	330
Less: reclassification adjustment for (gains) losses realized in net income, net of income taxes of $10 and $(103)	(22)	187
Unrealized (loss) gain on investments:	(46)	517
Total other comprehensive gain, net of tax	2,442	2,946
Comprehensive income	$ 91,179	$ 80,443

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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. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and 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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