INDEBTEDNESS - Effective Interest Rates on Convertible Notes Prior to and After the Adoption of ASU 2020-06 (Details) - Convertible Debt	Dec. 31, 2021	Jan. 01, 2021	Nov. 13, 2020	Mar. 05, 2020	May 25, 2018	Mar. 06, 2017
2027 Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate	3.66%		3.66%
2027 Convertible Notes | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate		0.30%
2026 Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate	3.35%		3.35%
2026 Convertible Notes | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate		0.49%
2025 Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate	3.81%			3.81%
2025 Convertible Notes | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate		0.43%
2023 Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate	4.69%				4.69%
2023 Convertible Notes | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate		0.66%
2022 Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate	5.34%					5.34%
2022 Convertible Notes | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate		0.93%