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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 145,449	$ 133,995	$ 161,148
Other comprehensive income (loss):
Foreign currency translation adjustments	(334)	1,357	(1,665)
Marketable securities
Change in net unrealized loss	(2,120)	0	0
Less: reclassification adjustment for net losses included in net income	0	0	0
Net change, net of income tax benefit of $745	(2,120)	0	0
Comprehensive income	$ 142,995	$ 135,352	$ 159,483

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