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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]        
Acquisition costs $ 128,415 $ 1,469,820 $ 122,399 $ 1,128,975
Acquisition costs, total 2,849,609      
Exploration costs 9,027 0 0 0
Exploration costs, total 9,027      
Development costs 548 869 4,536 5,789
Development costs, total 11,742      
Capitalized interest 2,120 2,915 (657) (1,719)
Capitalized interest, total 2,659      
Total oil and natural gas properties not subject to amortization 140,110 1,473,604 $ 126,278 $ 1,133,045
Total oil and natural gas properties not subject to amortization, total 2,873,037 $ 2,912,974    
Utica        
Property, Plant and Equipment [Line Items]        
Total oil and natural gas properties not subject to amortization, total 1,483,194      
MidContinent        
Property, Plant and Equipment [Line Items]        
Total oil and natural gas properties not subject to amortization, total 1,388,706      
Niobrara        
Property, Plant and Equipment [Line Items]        
Total oil and natural gas properties not subject to amortization, total 451      
Southern Louisiana        
Property, Plant and Equipment [Line Items]        
Total oil and natural gas properties not subject to amortization, total 586      
Bakken        
Property, Plant and Equipment [Line Items]        
Total oil and natural gas properties not subject to amortization, total $ 100