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LONG-TERM DEBT, NET - Schedule of Interest Expense, Exchangeable Notes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Long-term Debt      
Amortization of original issue discount $ 44,743 $ 30,429 $ 13,134
2022 Exchangeable Notes | Senior Notes      
Long-term Debt      
Contractual interest expense 4,528 4,528 4,528
Amortization of original issue discount 14,243 13,256 13,134
Amortization of debt issuance costs 3,525 2,981 3,489
Total interest expense recognized 22,296 20,765 $ 21,151
2026 Exchangeable Notes | Senior Notes      
Long-term Debt      
Contractual interest expense 5,031 2,963  
Amortization of original issue discount 17,231 9,759  
Amortization of debt issuance costs 1,305 758  
Total interest expense recognized 23,567 13,480  
2030 Exchangeable Notes | Senior Notes      
Long-term Debt      
Contractual interest expense 11,500 6,772  
Amortization of original issue discount 13,269 7,413  
Amortization of debt issuance costs 721 420  
Total interest expense recognized $ 25,490 $ 14,605