Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 674,035	$ 703,701	$ 505,624
Other comprehensive income (loss), net of tax:
Net changes in unrealized gains (losses) on AFS investment securities	43,402	(8,652)	(2,126)
Foreign currency translation adjustments	(3,636)	(5,732)	12,753
Other comprehensive income (loss)	39,766	(14,384)	10,627
COMPREHENSIVE INCOME	$ 713,801	$ 689,317	$ 516,251