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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]        
Acquisition costs $ 147,382 $ 515,905 $ 314,077  
Acquisition costs, total 1,549,288     $ 571,924
Exploration costs 0 0 0  
Exploration costs, total 0     0
Development costs 18,853 5,067 3,248  
Development costs, total 28,701     1,533
Capitalized interest 3,632 (876) (2,504)  
Capitalized interest, total 2,316     2,064
Total oil and gas properties not subject to amortization 169,867 520,096 $ 314,821  
Total oil and gas properties not subject to amortization, total 1,580,305 $ 1,817,701   $ 575,521
Utica        
Property, Plant and Equipment [Line Items]        
Total oil and gas properties not subject to amortization, total 1,577,207      
Niobrara        
Property, Plant and Equipment [Line Items]        
Total oil and gas properties not subject to amortization, total 2,172      
Southern Louisiana        
Property, Plant and Equipment [Line Items]        
Total oil and gas properties not subject to amortization, total 462      
Bakken        
Property, Plant and Equipment [Line Items]        
Total oil and gas properties not subject to amortization, total 96      
Other        
Property, Plant and Equipment [Line Items]        
Total oil and gas properties not subject to amortization, total $ 368