CONSOLIDATED STATEMENTS OF CONVERTIBLE COMMON SHARES AND SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Common Stock Convertible Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings (Accumulated Deficit)
Balance at Dec. 31, 2018	$ 1,522,354	$ 21,940		$ 1,671,645	$ (13,040)	$ (158,191)
Balance, Shares at Dec. 31, 2018		175,522,000
Net issuance of common stock under stock-based plans	10,622	$ 223		10,399
Net issuance of common stock under stock-based plans (in shares)		1,784,000
Stock-based compensation expense	38,085			38,085
Repurchase of common stock	(491,202)	$ (1,362)				(489,840)
Repurchase of common stock (in shares)		(10,896,000)
Cash dividends	(61,355)					(61,355)
Net income	467,468					467,468
Other comprehensive income/loss	(5,814)				(5,814)
Balance at Dec. 31, 2019	1,480,158	$ 20,801		1,720,129	(18,854)	(241,918)
Balance, Shares at Dec. 31, 2019		166,410,000
Net issuance of common stock under stock-based plans	4,850	$ 154		4,696
Net issuance of common stock under stock-based plans (in shares)		1,230,000
Stock-based compensation expense	44,285			44,285
Repurchase of common stock	(88,465)	$ (190)				(88,275)
Repurchase of common stock (in shares)		(1,517,000)
Cash dividends	(66,540)					(66,540)
Convertible common shares	(3,787)		$ 3,787	(3,787)
Net income	784,147					784,147
Other comprehensive income/loss	52,370				52,370
Balance at Dec. 31, 2020	2,207,018	$ 20,765	3,787	1,765,323	33,516	387,414
Balance, Shares at Dec. 31, 2020		166,123,000
Net issuance of common stock under stock-based plans		$ 113		(225)	(112)
Net issuance of common stock under stock-based plans (in shares)		899,000
Stock-based compensation expense	45,632			45,632
Repurchase of common stock	(600,000)	$ (597)				(599,403)
Repurchase of common stock (in shares)		(4,771,000)
Cash dividends	(66,034)					(66,034)
Convertible common shares	2,275		$ (2,275)	2,275
Settlements of convertible notes	985,640	$ 1,018		984,622
Settlement of convertible notes (in shares)		8,148
Exercise of convertible notes hedge call options	(987,100)	$ (1,018)		(986,082)
Exercise of convertible notes hedge call options (in shares)		(8,148)
Net income	1,014,589					1,014,589
Other comprehensive income/loss	(39,464)				(39,464)
Balance at Dec. 31, 2021	$ 2,562,444	$ 20,281		$ 1,811,545	$ (5,948)	$ 736,566
Balance, Shares at Dec. 31, 2021		162,251,000	1,512,000