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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Oil and natural gas properties    
Proved $ 12,093,492 $ 12,529,681
Unproved 322,580 363,149
Total oil and natural gas properties 12,416,072 12,892,830
Less: accumulated depreciation, depletion and impairment (11,637,538) (11,149,888)
Net oil and natural gas properties capitalized costs 778,534 1,742,942
Land 5,210 14,260
Non-oil and natural gas equipment 240,402 373,687
Buildings and structures 228,753 227,673
Total 474,365 615,620
Less accumulated depreciation and amortization (116,837) (123,860)
Other property, plant and equipment, net 357,528 491,760
Total property, plant and equipment, net 1,136,062 2,234,702
Oil and natural gas proved properties    
Property, Plant and Equipment    
Cumulative capitalized interest 51,100 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