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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 505,868	$ 404,389	$ 333,817
Other comprehensive (loss) gain, net of tax:
Foreign currency translation adjustments	(12,065)	17,597	(12,131)
Unrealized holding (loss) gain on investments:
Unrealized holding (losses) gains during the period, net of income taxes of $285, $1 and $457	(1,088)	190	(918)
Less: reclassification adjustment for losses realized in net income, net of income taxes of $(96), $(99) and $(201)	61	260	384
Total other comprehensive (loss) gain, net of taxes	(13,092)	18,047	(12,665)
Comprehensive income	$ 492,776	$ 422,436	$ 321,152

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