LONG-TERM DEBT, NET - Schedule of Interest Expense, Exchangeable Notes (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
2022 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,132	$ 1,132	$ 3,396	$ 3,396
Amortization of debt issuance costs	930	915	2,757	2,718
Total interest expense recognized	$ 2,062	2,047	$ 6,153	6,114
Effective interest rate (as a percent)	1.60%		1.60%
2026 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,257	1,257	$ 3,773	3,773
Amortization of debt issuance costs	390	386	1,178	1,146
Total interest expense recognized	$ 1,647	1,643	$ 4,951	4,919
Effective interest rate (as a percent)	1.20%		1.20%
2030 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 2,875	2,875	$ 8,625	8,625
Amortization of debt issuance costs	244	239	744	711
Total interest expense recognized	$ 3,119	$ 3,114	$ 9,369	$ 9,336
Effective interest rate (as a percent)	2.20%		2.20%