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FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivatives:      
Derivative asset $ 46,970 $ 95,500  
Derivative liability 56,205 72,126  
Foreign exchange swaps liability (5,798) 0  
Debt deferred charges 32,924 16,837  
Oil derivative instrument      
Derivatives:      
Derivative asset 45,640 84,730  
Derivative liability     $ 79,600
Interest rate swap      
Derivatives:      
Derivative asset 84 10,770  
Derivative liability 5,798 0  
Foreign exchange swap      
Derivatives:      
Derivative asset 214 0  
Foreign exchange swaps asset 1,246 0  
Foreign exchange swaps liability 0 (1,322)  
Equity Swap      
Derivatives:      
Derivative liability 50,407 70,804  
Level 1 | Carrying value      
Non-derivatives:      
Cash and cash equivalents 222,123 217,835  
Restricted cash and short-term deposits 188,289 486,426  
Level 1 | Fair value      
Non-derivatives:      
Cash and cash equivalents 222,123 217,835  
Restricted cash and short-term deposits 188,289 486,426  
Level 2 | Carrying value      
Non-derivatives:      
Current portion of long-term debt and short-term debt (1,244,599) (732,184)  
Long-term debt - convertible bonds (368,134) (353,661)  
Long-term debt (956,018) (1,496,351)  
Level 2 | Carrying value | Oil derivative instrument      
Derivatives:      
Derivative asset 45,640 84,730  
Level 2 | Carrying value | Interest rate swap      
Derivatives:      
Derivative asset 84 10,770  
Derivative liability (5,798) 0  
Level 2 | Carrying value | Foreign exchange swap      
Derivatives:      
Foreign exchange swaps asset 1,246 0  
Foreign exchange swaps liability 0 (1,322)  
Level 2 | Carrying value | Equity Swap      
Derivatives:      
Derivative liability 50,407 70,804  
Level 2 | Fair value      
Non-derivatives:      
Current portion of long-term debt and short-term debt (1,244,599) (732,184)  
Long-term debt - convertible bonds (355,943) (373,029)  
Long-term debt (956,018) (1,496,351)  
Level 2 | Fair value | Oil derivative instrument      
Derivatives:      
Derivative asset 45,640 84,730  
Level 2 | Fair value | Interest rate swap      
Derivatives:      
Derivative asset 84 10,770  
Derivative liability (5,798) 0  
Level 2 | Fair value | Foreign exchange swap      
Derivatives:      
Foreign exchange swaps asset 1,246 0  
Foreign exchange swaps liability 0 (1,322)  
Level 2 | Fair value | Equity Swap      
Derivatives:      
Derivative liability $ 50,407 $ 70,804