Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Summary of Oil and Gas Properties Not Subject to Amortization (Details)

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Property and Equipment - Summary of Oil and Gas Properties Not Subject to Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]        
Acquisition costs $ 9,089 $ 98,870 $ 756,963 $ 806,982
Acquisition costs, total 1,671,904      
Exploration costs 259 0 0 0
Exploration costs, total 259      
Development costs 1,213 548 869 10,325
Development costs, total 12,955      
Capitalized interest 888 413 247 0
Capitalized interest, total 1,548      
Total oil and natural gas properties not subject to amortization 11,449 99,831 $ 758,079 $ 817,307
Total oil and natural gas properties not subject to amortization, total 1,686,666 $ 2,873,037    
Utica        
Property, Plant and Equipment [Line Items]        
Total oil and natural gas properties not subject to amortization, total 976,593      
MidContinent        
Property, Plant and Equipment [Line Items]        
Total oil and natural gas properties not subject to amortization, total 709,739      
Other Properties        
Property, Plant and Equipment [Line Items]        
Total oil and natural gas properties not subject to amortization, total $ 334