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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 139,838	$ 88,737
Other comprehensive gain (loss), net of tax:
Foreign currency translation adjustments	3,377	2,488
Unrealized loss on investments:
Unrealized losses during the period, net of income taxes of $424 and $19	(1,357)	(24)
Less: reclassification adjustment for gains realized in net income, net of income taxes of $(15) and $10	(273)	(22)
Unrealized loss on investments:	(1,630)	(46)
Total other comprehensive gain, net of tax	1,747	2,442
Comprehensive income	$ 141,585	$ 91,179

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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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