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DEBT (Schedule of Interest Expense Related) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Non-cash amortization of debt discount $ 13,297 $ 9,236 $ 8,670
2017 Exchangeable Notes      
Debt Instrument [Line Items]      
Amortization of debt issuance costs 820 753 694
Non-cash amortization of debt discount 7,483 7,153 6,855
Interest expense 3,594 3,594 3,594
Total interest expense recognized $ 11,897 $ 11,500 $ 11,143
Effective interest rate 4.68% 4.68% 4.68%
2020 Exchangeable Notes      
Debt Instrument [Line Items]      
Amortization of debt issuance costs $ 492    
Non-cash amortization of debt discount 2,165    
Interest expense 0    
Total interest expense recognized $ 2,657    
Effective interest rate 1.87%