Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 173,015	$ 86,589
Other comprehensive income/(loss), net of tax
Changes in unrealized losses on available-for-sale securities	[1]	(22,670)	(73,227)
Changes in unrealized gains/(losses) on cash flow hedging instruments	[2]		(1,706)
Foreign currency translation adjustment		2,336	(9,822)
Total other comprehensive loss, net of tax		(20,334)	(84,755)
Comprehensive income		$ 152,681	$ 1,834

[1] There were no reclassifications to earnings for the three months ended March 31, 2021. Net of reclassifications to earnings of realized losses of $0.5 million during the three months ended March 31, 2020.

[2] Reclassifications to earnings were immaterial for the three months ended March 31, 2021. Net of reclassifications to earnings of losses of $0.3 million for the three months ended March 31, 2020.