Debt - Additional Information Related to Senior and Convertible Notes (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Oct. 07, 2020	Nov. 15, 2019	Jun. 10, 2014
Debt Instrument [Line Items]
Principal amount	$ 1,191,276
Less: Unamortized discount	(91,593)	$ (112,798)
Deferred issuance costs	(9,056)	(11,505)
Total debt	1,090,627	1,579,021
Convertible Debt
Debt Instrument [Line Items]
Principal amount	1,191,276	1,702,414
4.625% Senior Notes Due in 2030 | Senior Notes
Debt Instrument [Line Items]
Principal amount	641,276	750,000	$ 750,000
Less: Unamortized discount	(4,259)
Deferred issuance costs	(1,339)
Total debt	635,678
3.25% Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Additional paid-in capital	0	37,688			$ 37,700
Principal amount	0	402,414
Less: Unamortized discount	0	(4,644)			$ (59,000)
Deferred issuance costs	0	(855)
Total debt	0	396,915
1.75% Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Additional paid-in capital	88,138	88,138		$ 88,100
Principal amount	550,000	550,000
Less: Unamortized discount	(87,334)	(102,631)		(118,900)
Deferred issuance costs	(7,717)	(8,889)		$ (2,800)
Total debt	$ 454,949	$ 438,480