CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 641,207	$ 362,173
Other comprehensive income (loss):
Unrealized gains (losses) on investments	(10,071)	4,803
Unrealized gains (losses) on cash flow hedges	23,423	(45,694)
Total unrealized gains (losses)	13,352	(40,891)
Income tax (expense) benefit	(3,229)	9,984
Other comprehensive income (loss), net of tax (expense) benefit	10,123	(30,907)
Total comprehensive income	$ 651,330	$ 331,266