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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets:    
Total assets $ 14,205 $ 1,320
Liabilities:    
Total liabilities   19,815
Commodity derivative instruments    
Liabilities:    
Total liabilities   19,815
Money market funds    
Assets:    
Total assets 14,005 146
Commodity derivative instruments    
Assets:    
Total assets 200 1,174
Level 1    
Assets:    
Total assets 14,005 146
Liabilities:    
Total liabilities   0
Level 1 | Commodity derivative instruments    
Liabilities:    
Total liabilities   0
Level 1 | Money market funds    
Assets:    
Total assets 14,005 146
Level 1 | Commodity derivative instruments    
Assets:    
Total assets 0 0
Level 2    
Assets:    
Total assets 200 1,174
Liabilities:    
Total liabilities   19,815
Level 2 | Commodity derivative instruments    
Liabilities:    
Total liabilities   19,815
Level 2 | Money market funds    
Assets:    
Total assets 0 0
Level 2 | Commodity derivative instruments    
Assets:    
Total assets 200 1,174
Level 3    
Assets:    
Total assets 0 0
Liabilities:    
Total liabilities   0
Level 3 | Commodity derivative instruments    
Liabilities:    
Total liabilities   0
Level 3 | Money market funds    
Assets:    
Total assets 0 0
Level 3 | Commodity derivative instruments    
Assets:    
Total assets $ 0 $ 0