LONG-TERM DEBT, NET - Schedule of Interest Expense, Exchangeable Notes (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
2022 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,132	$ 1,132
Amortization of debt issuance costs	907	898
Total interest expense recognized	$ 2,039	2,030
Effective interest rate (as a percent)	1.60%
2026 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,258	1,258
Amortization of debt issuance costs	401	380
Total interest expense recognized	$ 1,659	1,638
Effective interest rate (as a percent)	1.20%
2030 Exchangeable Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 2,875	2,875
Amortization of debt issuance costs	257	235
Total interest expense recognized	$ 3,132	$ 3,110
Effective interest rate (as a percent)	2.20%