Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Classification of Outstanding Financial Instruments (Details)

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Classification of Outstanding Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Offsetting Assets [Line Items]    
Current Derivative Assets $ 2,005 $ 51,290
Noncurrent Derivative Assets 356 111
Total derivative assets 9,193 56,218
Current liabilities (35,108) (3,078)
Noncurrent liabilities (61,987) (14,659)
Total derivative liabilities (103,927) (22,554)
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 9,193 56,218
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (6,833) (4,817)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 2,360 51,401
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (103,927) (22,554)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 6,833 4,817
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (97,094) (17,737)
Current Assets    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 6,961 52,739
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (4,956) (1,449)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 2,005 51,290
Noncurrent Assets    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 2,232 3,479
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (1,876) (3,369)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 356 111
Current Liabilities    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (40,064) (4,527)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 4,956 1,449
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (35,108) (3,078)
Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (63,863) (18,028)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 1,876 3,369
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (61,987) (14,659)
Commodity Price Swap Contracts | Current Assets    
Offsetting Assets [Line Items]    
Current Derivative Assets 6,390 52,702
Commodity Price Swap Contracts | Noncurrent Assets    
Offsetting Assets [Line Items]    
Noncurrent Derivative Assets 1,478 3,479
Commodity Price Swap Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (29,497) (3,434)
Commodity Price Swap Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities (8,381) (399)
Commodity Basis Swap Contracts | Current Assets    
Offsetting Assets [Line Items]    
Current Derivative Assets 325 37
Commodity Basis Swap Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (6,367) (519)
Commodity Price Swaptions Contracts | Current Assets    
Offsetting Assets [Line Items]    
Current Derivative Assets 246 0
Commodity Price Swaptions Contracts | Noncurrent Assets    
Offsetting Assets [Line Items]    
Noncurrent Derivative Assets 749 0
Commodity Price Swaptions Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (3,601) 0
Commodity Price Swaptions Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities (43,076) (17,184)
Interest Rate Swap Contracts | Noncurrent Assets    
Offsetting Assets [Line Items]    
Noncurrent Derivative Assets 5 0
Interest Rate Swap Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (599) (574)
Interest Rate Swap Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities (184) (445)
Commodity Price Call Option Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities $ (12,222) $ 0