Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Amounts and Classification of Outstanding Derivative Financial Instruments and Reconciliation Between Gross Assets and Liabilities (Details)

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Amounts and Classification of Outstanding Derivative Financial Instruments and Reconciliation Between Gross Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Current Derivative Assets $ 62,531 $ 115,870
Noncurrent Derivative Assets 42,682 61,843
Total derivative assets 116,954 177,713
Total derivative liabilities (11,741) 0
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 116,954 178,477
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (11,741) (764)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 105,213 177,713
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (11,741) (764)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 11,741 764
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities 0 0
Current Assets    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 65,018 116,620
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (2,486) (750)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 62,531 115,870
Noncurrent Assets    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 51,937 61,857
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (9,254) (14)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 42,682 61,843
Current Liabilities    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (2,486) (750)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 2,486 750
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities 0 0
Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (9,254) (14)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 9,254 14
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities 0 0
Price Swap Contracts | Current Assets    
Offsetting Assets [Line Items]    
Current Derivative Assets 65,018 108,514
Price Swap Contracts | Noncurrent Assets    
Offsetting Assets [Line Items]    
Noncurrent Derivative Assets 51,937 61,843
Price Swap Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (2,486) 0
Price Swap Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities (653) 0
Basis Swap Contracts | Current Assets    
Offsetting Assets [Line Items]    
Current Derivative Assets 0 7,356
Price Swaptions Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities $ (8,601) $ 0