Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Classification of Outstanding Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Offsetting Assets [Line Items]    
Current Derivative Assets $ 51,290 $ 5,628
Noncurrent Derivative Assets 111 8,554
Current liabilities (3,078) (11,298)
Noncurrent liabilities (14,659) (8,079)
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 56,218 36,233
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (4,817) (22,051)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 51,401 14,182
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Liabilities (22,554) (41,428)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 4,817 22,051
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (17,737) (19,377)
Current Assets    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 52,739 20,164
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (1,449) (14,536)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 51,290 5,628
Noncurrent Assets    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 3,479 16,069
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets (3,369) (7,515)
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 111 8,554
Current Liabilities    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Liabilities (4,527) (25,834)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 1,449 14,536
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (3,078) (11,298)
Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets (Liabilities), Offsetting of Derivative Liabilities (18,028) (15,594)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 3,369 7,515
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (14,659) (8,079)
Commodity Derivative    
Offsetting Assets [Line Items]    
Total derivative assets 56,218 36,233
Total derivative liabilities (22,554) (41,428)
Commodity Basis Swap Contracts | Current Assets    
Offsetting Assets [Line Items]    
Current Derivative Assets   0
Commodity Basis Swap Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (519) 0
Commodity Price Swaptions Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities (17,184) (10,321)
Commodity Price Swap Contracts | Current Assets    
Offsetting Assets [Line Items]    
Current Derivative Assets 52,702 20,164
Commodity Price Swap Contracts | Noncurrent Assets    
Offsetting Assets [Line Items]    
Noncurrent Derivative Assets 3,479 16,069
Commodity Price Swap Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (3,434) (25,834)
Commodity Price Swap Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities (399) (5,273)
Interest Rate Swap Contracts | Current Liabilities    
Offsetting Assets [Line Items]    
Current liabilities (574) 0
Interest Rate Swap Contracts | Noncurrent Liabilities    
Offsetting Assets [Line Items]    
Noncurrent liabilities $ (445) $ 0