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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 350,158	$ 176,553	$ 176,253
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustments	726	(2,736)	4,689
Unrealized gain (loss) on available-for-sale securities, net of income taxes	147	159	(186)
Other comprehensive income (loss), net of income taxes	873	(2,577)	4,503
Comprehensive income	$ 351,031	$ 173,976	$ 180,756

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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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