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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.

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