LONG-TERM DEBT, NET - Schedule of Interest Expense, Exchangeable Notes (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
2022 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,132	$ 1,132	$ 2,264	$ 2,264
Amortization of debt issuance costs	920	905	1,827	1,803
Total interest expense recognized	$ 2,052	2,037	$ 4,091	4,067
Effective interest rate (as a percent)	1.60%		1.60%
2026 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,258	1,258	$ 2,516	2,516
Amortization of debt issuance costs	387	380	788	760
Total interest expense recognized	$ 1,645	1,638	$ 3,304	3,276
Effective interest rate (as a percent)	1.20%		1.20%
2030 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 2,875	2,875	$ 5,750	5,750
Amortization of debt issuance costs	243	237	500	472
Total interest expense recognized	$ 3,118	$ 3,112	$ 6,250	$ 6,222
Effective interest rate (as a percent)	2.20%		2.20%