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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oil and natural gas properties      
Proved $ 12,529,681 $ 11,707,147 $ 10,972,816
Unproved 363,149 290,596 531,606
Total oil and natural gas properties 12,892,830 11,997,743 11,504,422
Less: accumulated depreciation, depletion and impairment (11,149,888) (6,359,149) (5,762,969)
Net oil and natural gas properties capitalized costs 1,742,942 5,638,594 $ 5,741,453
Land 14,260 16,300  
Non-oil and natural gas equipment 373,687 602,392  
Buildings and structures 227,673 263,191  
Total 615,620 881,883  
Less accumulated depreciation and amortization (123,860) (305,420)  
Other property, plant and equipment, net 491,760 576,463  
Total property, plant and equipment, net $ 2,234,702 $ 6,215,057