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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 25,111	$ 27,800	$ 49,168	$ 37,951
Other comprehensive income:
Change in unrealized gain on available-for-sale investments, net of tax	116		274
Comprehensive income	$ 25,227	$ 27,800	$ 49,442	$ 37,951

X

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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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