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FINANCIAL INSTRUMENTS - Fair Values of Derivative Instruments on a Gross Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]      
Derivative asset $ 46,970 $ 95,500  
Derivative liability 56,205 72,126  
Net amount 5,798 0  
Oil derivative instrument      
Derivative [Line Items]      
Derivative asset 45,640 84,730  
Derivative liability     $ 79,600
Foreign exchange swap      
Derivative [Line Items]      
Derivative asset 214 0  
Foreign exchange swaps asset 1,246 0  
Net amount 0 1,322  
Interest rate swap      
Derivative [Line Items]      
Derivative asset 84 10,770  
Derivative liability 5,798 0  
Equity Swap      
Derivative [Line Items]      
Derivative liability $ 50,407 $ 70,804