Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 144,824	$ 164,024
Other comprehensive income (loss), net of tax:
Net changes in unrealized gains on AFS debt securities	27,453	22,011
Foreign currency translation adjustments	(2,164)	3,180
Other comprehensive income	25,289	25,191
COMPREHENSIVE INCOME	$ 170,113	$ 189,215