CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 342,073	$ 140,201	$ 470,885	$ 781,408
Other comprehensive income (loss):
Unrealized losses on investments	(48,188)	2,354	(129,229)	(7,717)
Unrealized gains on cash flow hedges	15,895	856	68,425	24,279
Total unrealized gains (losses)	(32,293)	3,210	(60,804)	16,562
Income tax (expense) benefit	7,808	(773)	14,702	(4,002)
Other comprehensive income (loss), net of tax (expense) benefit	(24,485)	2,437	(46,102)	12,560
Total comprehensive income	$ 317,588	$ 142,638	$ 424,783	$ 793,968