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Derivatives - Schedule of Fair Values (Gross and Net) of Outstanding Derivatives (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Total derivatives $ 4,733 $ 91,885
Commodity Contracts | Current assets    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized at Fair Value 17,799 89,981
Gross Amounts Offset on Balance Sheet (8,633) (1,385)
Net Fair Value Presented on Balance Sheet 9,166 88,596
Commodity Contracts | Non-current assets    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized at Fair Value 773 3,289
Gross Amounts Offset on Balance Sheet (248) 0
Net Fair Value Presented on Balance Sheet 525 3,289
Commodity Contracts | Current liabilities    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized at Fair Value (13,450) (1,385)
Gross Amounts Offset in the Balance Sheet 8,633 1,385
Net Fair Value Presented in the Balance Sheet (4,817) $ 0
Commodity Contracts | Non-current liabilities    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized at Fair Value (389)  
Gross Amounts Offset in the Balance Sheet 248  
Net Fair Value Presented in the Balance Sheet $ (141)