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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Oil and natural gas properties    
Proved $ 12,029,734 $ 12,529,681
Unproved 338,573 363,149
Total oil and natural gas properties 12,368,307 12,892,830
Less: accumulated depreciation, depletion and impairment (11,313,610) (11,149,888)
Net oil and natural gas properties capitalized costs 1,054,697 1,742,942
Land 5,210 14,260
Non-oil and natural gas equipment 306,989 373,687
Buildings and structures 230,685 227,673
Total 542,884 615,620
Less accumulated depreciation and amortization (122,329) (123,860)
Other property, plant and equipment, net 420,555 491,760
Total property, plant and equipment, net 1,475,252 2,234,702
Oil and natural gas proved properties    
Property, Plant and Equipment    
Cumulative capitalized interest 50,900 48,900
Non-oil and natural gas equipment    
Property, Plant and Equipment    
Cumulative capitalized interest 4,300 4,300
Buildings and structures    
Property, Plant and Equipment    
Cumulative capitalized interest $ 20,400 $ 20,400