INDEBTEDNESS - Net Carrying Amount of Convertible Notes (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Convertible Debt
Debt Instrument [Line Items]
Principal Outstanding	$ 4,610,630	$ 4,611,085
Unamortized Debt Issuance Costs	(48,719)	(51,422)
Net Carrying Value	4,561,911	4,559,663
2031 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal Outstanding	1,000,000	1,000,000
Unamortized Debt Issuance Costs	(12,884)	(13,226)
Net Carrying Value	987,116	986,774
2026 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal Outstanding	1,000,000	1,000,000
Unamortized Debt Issuance Costs	(11,688)	(12,374)
Net Carrying Value	988,312	987,626
2027 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Principal Outstanding	575,000	575,000
Unamortized Debt Issuance Costs	(7,465)	(7,792)
Net Carrying Value	567,535	567,208
2026 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Principal Outstanding	575,000	575,000
Unamortized Debt Issuance Costs	(6,961)	(7,379)
Net Carrying Value	568,039	567,621
2025 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Principal Outstanding	1,000,000	1,000,000
Unamortized Debt Issuance Costs	(8,891)	(9,639)
Net Carrying Value	991,109	990,361
2023 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Principal Outstanding	460,630	460,630
Unamortized Debt Issuance Costs	(830)	(1,012)
Net Carrying Value	$ 459,800	459,618
2022 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Principal Outstanding		455
Unamortized Debt Issuance Costs		0
Net Carrying Value		$ 455