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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Oil and natural gas properties      
Proved $ 12,262,921 [1] $ 8,969,296 [1] $ 8,159,924
Unproved 865,863 689,393 547,953
Total oil and natural gas properties 13,128,784 9,658,689 8,707,877
Less accumulated depreciation, depletion and impairment (5,231,182) (4,791,534) (4,483,736)
Net oil and natural gas properties capitalized costs 7,897,602 4,867,155 4,224,141
Land 17,927 14,196  
Non-oil and natural gas equipment 643,370 [2] 668,391 [2]  
Buildings and structures 205,349 133,147  
Total 866,646 815,734  
Less accumulated depreciation and amortization (284,271) (293,465)  
Other property, plant and equipment, net 582,375 522,269  
Total property, plant and equipment, net $ 8,479,977 $ 5,389,424  
[1] Includes cumulative capitalized interest on oil and natural gas properties of $11.7 million and $1.6 million at December 31, 2012 and 2011, respectively.
[2] Includes cumulative capitalized interest of approximately $11.4 million and $6.7 million at December 31, 2012 and 2011, respectively.