CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 140,201	$ (85,211)	$ 781,408	$ 276,962
Other comprehensive income (loss):
Unrealized gains (losses) on investments	2,354	1,211	(7,717)	6,014
Unrealized gains (losses) on cash flow hedges	856	(2,343)	24,279	(48,037)
Total unrealized gains (losses)	3,210	(1,132)	16,562	(42,023)
Income tax (expense) benefit	(773)	335	(4,002)	10,319
Other comprehensive income (loss), net of tax (expense) benefit	2,437	(797)	12,560	(31,704)
Total comprehensive income (loss)	$ 142,638	$ (86,008)	$ 793,968	$ 245,258