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Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 88,132	$ 59,446
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustments	278	132
Unrealized gain (loss) on available-for-sale securities, net of tax	100	(101)
Other comprehensive income, net of income taxes	378	31
Comprehensive income	$ 88,510	$ 59,477

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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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