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DEBT - Schedule of Carrying Values USD $ (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Aug. 30, 2020
Jan. 31, 2017
2020 Exchangeable Notes        
Debt Instrument [Line Items]        
Principal $ 460,000,000 $ 460,000,000 $ 460,000,000  
Conversion option (Level 2) 0      
Debt issuance costs, net of amortization (5,975,000) (7,460,000)    
Unamortized discount (24,758,000) (31,203,000)    
Net liability carrying amount 429,267,000 421,337,000    
Equity component - net carrying value 32,746,000 32,746,000    
2017 Exchangeable Notes        
Debt Instrument [Line Items]        
Principal 110,187,000 287,495,000   $ 110,187,000
Conversion option (Level 2) 292,940,000      
Debt issuance costs, net of amortization (780,000) (2,914,000)    
Unamortized discount (6,401,000) (24,700,000)    
Net liability carrying amount 395,946,000 259,881,000    
Equity component - net carrying value $ 0 $ 51,176,000