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INCOME TAXES (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Valuation Allowance [Line Items]      
Provisional income tax expense   $ 87,300  
Current income tax receivable   $ 36,260 $ 16,212
Proceeds from income tax refunds received $ 20,100    
Ceiling Test Write Downs From Decline in Commodity Prices      
Valuation Allowance [Line Items]      
Valuation allowance     $ 127,100