Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 159,537	$ 171,416	$ 403,713	$ 485,820
Other comprehensive income (loss), net of tax:
Net changes in unrealized gains on AFS debt securities	4,634	11,863	49,903	62,901
Net changes in unrealized gains (losses) on cash flow hedge	87	0	(1,246)	0
Foreign currency translation adjustments	5,459	(2,858)	3,065	(5,694)
Other comprehensive income	10,180	9,005	51,722	57,207
COMPREHENSIVE INCOME	$ 169,717	$ 180,421	$ 455,435	$ 543,027