Shareholders' Equity - Summary of Activities in Common Stock (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Purchases of treasury shares	$ 0	$ (2)	$ (12,975)	$ (15,484)
Purchases of treasury (in shares)	0	0	(32)	(59)
Stock option exercises	$ 17,045	$ 8,395	$ 46,433	$ 100,732
Stock option exercises (in shares)	103	72	313	989
Employee stock plan purchases	$ 3,557	$ 3,032	$ 9,757	$ 8,209
Employee stock plan purchases (in shares)	9	11	26	31
Restricted stock units vested, net of withheld shares upon award settlement	$ (1,451)	$ (316)	$ (17,461)	$ (7,208)
Restricted stock units vested, net of withheld shares upon award settlement (in shares)	5	2	104	45