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Shareholders' Equity - Summary of Activities in Common Stock (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Purchases of treasury shares	$ 0	$ (15,482)
Purchases of treasury (in shares)	0	(59)
Exercise of stock options and vesting of restricted stock units	$ 18,102	$ 46,236
Stock option exercises (in shares)	120	481
Employee stock plan purchases	$ 3,038	$ 2,469
Employee stock plan purchases (in shares)	8	10
Restricted stock units vested, net of withheld shares upon award settlement	$ (8,958)	$ (2,301)
Restricted stock units vested, net of withheld shares upon award settlement (in shares)	56	10

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