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Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 91,028	$ 46,884	$ 179,160	$ 106,330
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustments	555	(1,580)	833	(1,448)
Unrealized gain (loss) on available-for-sale securities, net of tax	42	82	142	(19)
Other comprehensive income (loss), net of income taxes	597	(1,498)	975	(1,467)
Comprehensive income	$ 91,625	$ 45,386	$ 180,135	$ 104,863

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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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