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Shareholders' Equity - Summary of Activities in Common Stock (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity [Abstract]
Purchases of treasury shares	$ (12,975)	$ 0	$ (12,975)	$ (15,482)
Purchases of treasury (in shares)	(32)	0	(32)	(59)
Exercise of stock options and vesting of restricted stock units	$ 11,286	$ 46,101	$ 29,388	$ 92,337
Stock option exercises (in shares)	89	436	210	917
Employee stock plan purchases	$ 3,162	$ 2,708	$ 6,200	$ 5,177
Employee stock plan purchases (in shares)	9	10	17	20
Restricted stock units vested, net of withheld shares upon award settlement	$ (7,052)	$ (4,591)	$ (16,010)	$ (6,892)
Restricted stock units vested, net of withheld shares upon award settlement (in shares)	43	33	99	43

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Share-Based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Vested In Period, Net Of Withheld Shares Upon Award Settlement

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Number of shares issued during the period as a result of an employee stock purchase plan.

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