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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oil and natural gas properties      
Proved $ 10,972,816 [1] $ 12,262,921 [1] $ 8,969,296
Unproved 531,606 865,863 689,393
Total oil and natural gas properties 11,504,422 13,128,784 9,658,689
Less: accumulated depreciation, depletion and impairment (5,762,969) (5,231,182) (4,791,534)
Net oil and natural gas properties capitalized costs 5,741,453 7,897,602 4,867,155
Land 18,423 17,927  
Non-oil and natural gas equipment 600,603 [2] 643,370 [2]  
Buildings and structures 233,405 [3] 205,349 [3]  
Total 852,431 866,646  
Less accumulated depreciation and amortization (286,209) (284,271)  
Other property, plant and equipment, net 566,222 582,375  
Total property, plant and equipment, net $ 6,307,675 $ 8,479,977  
[1] Includes cumulative capitalized interest of approximately $23.4 million and $11.7 million at December 31, 2013 and 2012, respectively.
[2] Includes cumulative capitalized interest of approximately $4.3 million at both December 31, 2013 and 2012.
[3] Includes cumulative capitalized interest of approximately $12.0 million and $7.1 million at December 31, 2013 and 2012, respectively.