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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 355,766	$ 350,158	$ 176,553
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustments	1,134	726	(2,736)
Unrealized gain on available-for-sale securities, net of income taxes	0	147	159
Other comprehensive income (loss), net of income taxes	1,134	873	(2,577)
Comprehensive income	$ 356,900	$ 351,031	$ 173,976

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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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