Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment (Narrative) (Details)

v3.7.0.1
Property and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Impairment of oil and gas properties $ 0 $ 218,991  
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool 138,300    
Capitalized general and administrative costs 8,400 $ 7,100  
Capitalized costs of oil and natural gas properties excluded from amortization $ 3,073,448   $ 1,580,305
Non-producing leases, extension term 5 years    
Minimum      
Property, Plant and Equipment [Line Items]      
Expected number of years amortization will commence 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Expected number of years amortization will commence 5 years