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Property, Plant and Equipment (Tables) | 3 Months Ended
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Mar. 31, 2013
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, plant and equipment consists of the following (in thousands):
| March 31, 2013 |  | December 31, 2012
Oil and natural gas properties |  |  |
Proved(1) | $ | 9,975,304 |  |  | $ | 12,262,921 |
Unproved | 548,923 |  |  | 865,863 |
Total oil and natural gas properties | 10,524,227 |  |  | 13,128,784 |
Less accumulated depreciation, depletion and impairment | (5,384,132 | ) |  | (5,231,182 | )
Net oil and natural gas properties capitalized costs | 5,140,095 |  |  | 7,897,602 |
Land | 17,929 |  |  | 17,927 |
Non-oil and natural gas equipment(2) | 657,115 |  |  | 643,370 |
Buildings and structures | 214,884 |  |  | 205,349 |
Total | 889,928 |  |  | 866,646 |
Less accumulated depreciation and amortization | (294,417 | ) |  | (284,271 | )
Other property, plant and equipment, net | 595,511 |  |  | 582,375 |
Total property, plant and equipment, net | $ | 5,735,606 |  |  | $ | 8,479,977 |
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(1) | Includes cumulative capitalized interest of $14.7 million and $11.7 million at March 31, 2013 and December 31, 2012, respectively.
(2) | Includes cumulative capitalized interest of approximately $12.4 million and $11.4 million at March 31, 2013 and December 31, 2012, respectively.

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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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