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Derivatives - Fair Values (Gross and Net) of Outstanding Derivatives (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Liabilities:    
Total derivatives $ (52,144) $ (20,814)
Commodity Contracts | Current assets    
Assets:    
Gross Amounts Recognized at Fair Value 30,356 15,217
Gross Amounts Offset in the Balance Sheet (29,472) (12,710)
Net Fair Value Presented  in the Balance Sheet 884 2,507
Commodity Contracts | Non-current assets    
Assets:    
Gross Amounts Recognized at Fair Value 36,287  
Gross Amounts Offset in the Balance Sheet (34,245)  
Net Fair Value Presented  in the Balance Sheet 2,042  
Commodity Contracts | Current liabilities    
Liabilities:    
Gross Amounts Recognized at Fair Value (68,939) (36,031)
Gross Amounts Offset in the Balance Sheet 29,472 12,710
Net Fair Value Presented  in the Balance Sheet (39,467) $ (23,321)
Commodity Contracts | Non-current liabilities    
Liabilities:    
Gross Amounts Recognized at Fair Value (49,848)  
Gross Amounts Offset in the Balance Sheet 34,245  
Net Fair Value Presented  in the Balance Sheet $ (15,603)