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DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting of Derivative Liabilities (Details) - Not designated as ASC 815 Hedges - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Offsetting Liabilities    
Gross Recognized Liabilities $ 18,345 $ 11,855
Net Recognized Fair Value Liabilities 8,099 8,063
Gross Recognized Assets/ Liabilities 80,903 (5,970)
Net Recognized Fair Value Assets/ Liabilities 80,903 (5,970)
Derivative liabilities current    
Offsetting Liabilities    
Gross Recognized Liabilities 7,085 6,050
Net Recognized Fair Value Liabilities 3,075 4,394
Derivative liabilities non-current    
Offsetting Liabilities    
Gross Recognized Liabilities 11,260 5,805
Net Recognized Fair Value Liabilities 5,024 3,669
Derivative commodity contracts | Derivative liabilities current    
Offsetting Liabilities    
Gross Recognized Liabilities 3,318 3,946
Gross Amounts Offset (3,284) (1,648)
Net Recognized Fair Value Liabilities 34 2,298
Derivative commodity contracts | Derivative liabilities non-current    
Offsetting Liabilities    
Gross Recognized Liabilities 4,290 1,761
Gross Amounts Offset (4,290) (1,759)
Net Recognized Fair Value Liabilities   2
Derivative interest rate swaps | Derivative liabilities current    
Offsetting Liabilities    
Gross Recognized Liabilities 3,767 2,104
Gross Amounts Offset (726) (8)
Net Recognized Fair Value Liabilities 3,041 2,096
Derivative interest rate swaps | Derivative liabilities non-current    
Offsetting Liabilities    
Gross Recognized Liabilities 6,970 4,044
Gross Amounts Offset (1,946) (377)
Net Recognized Fair Value Liabilities $ 5,024 $ 3,667