Quarterly report pursuant to Section 13 or 15(d)

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

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Summary of Classification of Outstanding Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivative Assets:    
Current derivative assets $ 518 $ 51,290
Noncurrent derivative assets 32 111
Total derivative assets 4,642 56,218
Derivative Liabilities:    
Current liabilities (140,694) (3,078)
Noncurrent liabilities (127,526) (14,659)
Total derivative liabilities (272,312) (22,554)
Offsetting of Derivative Assets:    
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Assets 4,642 56,218
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (4,092) (4,817)
Net Amounts of Assets (Liabilities) Presented in the Balance Sheet, Offsetting of Derivative Assets 550 51,401
Offsetting of Derivative Liabilities:    
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Liabilities (272,312) (22,554)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 4,092 4,817
Net Amounts of Assets (Liabilities) Presented in the Balance Sheet, Offsetting of Derivative Liabilities (268,220) (17,737)
Current Assets    
Offsetting of Derivative Assets:    
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Assets 3,111 52,739
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (2,593) (1,449)
Net Amounts of Assets (Liabilities) Presented in the Balance Sheet, Offsetting of Derivative Assets 518 51,290
Noncurrent Assets    
Offsetting of Derivative Assets:    
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Assets 1,531 3,479
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (1,499) (3,369)
Net Amounts of Assets (Liabilities) Presented in the Balance Sheet, Offsetting of Derivative Assets 32 111
Current Liabilities    
Offsetting of Derivative Liabilities:    
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Liabilities (143,287) (4,527)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 2,593 1,449
Net Amounts of Assets (Liabilities) Presented in the Balance Sheet, Offsetting of Derivative Liabilities (140,694) (3,078)
Noncurrent Liabilities    
Offsetting of Derivative Liabilities:    
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Liabilities (129,025) (18,028)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 1,499 3,369
Net Amounts of Assets (Liabilities) Presented in the Balance Sheet, Offsetting of Derivative Liabilities (127,526) (14,659)
Commodity Price Swap Contracts | Current Assets    
Derivative Assets:    
Current derivative assets 24 52,702
Commodity Price Swap Contracts | Noncurrent Assets    
Derivative Assets:    
Noncurrent derivative assets 57 3,479
Commodity Price Swap Contracts | Current Liabilities    
Derivative Liabilities:    
Current liabilities (130,278) (3,434)
Commodity Price Swap Contracts | Noncurrent Liabilities    
Derivative Liabilities:    
Noncurrent liabilities (32,345) (399)
Commodity Basis Swap Contracts | Current Assets    
Derivative Assets:    
Current derivative assets 1,977 37
Commodity Basis Swap Contracts | Noncurrent Assets    
Derivative Assets:    
Noncurrent derivative assets 342 0
Commodity Basis Swap Contracts | Current Liabilities    
Derivative Liabilities:    
Current liabilities (6,174) (519)
Commodity Basis Swap Contracts | Noncurrent Liabilities    
Derivative Liabilities:    
Noncurrent liabilities (342) 0
Commodity Price Swaptions Contracts | Current Assets    
Derivative Assets:    
Current derivative assets 1,110 0
Commodity Price Swaptions Contracts | Noncurrent Assets    
Derivative Assets:    
Noncurrent derivative assets 1,127 0
Commodity Price Swaptions Contracts | Current Liabilities    
Derivative Liabilities:    
Current liabilities (6,278) 0
Commodity Price Swaptions Contracts | Noncurrent Liabilities    
Derivative Liabilities:    
Noncurrent liabilities (60,028) (17,184)
Interest Rate Swap Contracts | Noncurrent Assets    
Derivative Assets:    
Noncurrent derivative assets 5 0
Interest Rate Swap Contracts | Current Liabilities    
Derivative Liabilities:    
Current liabilities (558) (574)
Interest Rate Swap Contracts | Noncurrent Liabilities    
Derivative Liabilities:    
Noncurrent liabilities (105) (445)
Commodity Price Call Option Contracts | Noncurrent Liabilities    
Derivative Liabilities:    
Noncurrent liabilities $ (36,206) $ 0