CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 72,840	$ 171,028	$ 854,248	$ 447,990
Other comprehensive income:
Unrealized gains (losses) on investments	(2,539)	1,545	(10,256)	7,559
Unrealized gains (losses) on cash flow hedges	5,095	5,252	29,374	(42,785)
Total unrealized gains (losses)	2,556	6,797	19,118	(35,226)
Income tax (expense) benefit	(619)	(1,667)	(4,621)	8,652
Other comprehensive income (loss), net of tax (expense) benefit	1,937	5,130	14,497	(26,574)
Total comprehensive income	$ 74,777	$ 176,158	$ 868,745	$ 421,416