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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 314,963	$ 238,334	$ 122,695
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	3,103	(2,668)	3,901
Net decrease in unrealized loss on investments	0	0	118
Total other comprehensive income (loss)	3,103	(2,668)	4,019
Total comprehensive income	$ 318,066	$ 235,666	$ 126,714

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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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