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DEBT (Schedule of Carrying Values USD $) (Details) - USD ($)
Dec. 31, 2020
Aug. 30, 2020
Dec. 31, 2019
Jan. 31, 2017
2020 Exchangeable Notes        
Debt Instrument [Line Items]        
Principal $ 460,000,000 $ 460,000,000    
Less: Debt issuance costs, net of amortization (7,460,000)      
Unamortized discount (31,203,000)      
Net liability carrying amount 421,337,000      
Equity component - net carrying value 32,746,000      
2017 Exchangeable Notes        
Debt Instrument [Line Items]        
Principal 287,495,000   $ 287,500,000 $ 287,495,000
Less: Debt issuance costs, net of amortization (2,914,000)   (3,735,000)  
Unamortized discount (24,700,000)   (32,182,000)  
Net liability carrying amount 259,881,000   251,583,000  
Equity component - net carrying value $ 51,176,000   $ 51,176,000