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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2012
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2012 |  | 2011
Oil and natural gas properties |  |  |
Proved(1) | $ | 12,262,921 |  |  | $ | 8,969,296 |
Unproved | 865,863 |  |  | 689,393 |
Total oil and natural gas properties | 13,128,784 |  |  | 9,658,689 |
Less accumulated depreciation, depletion and impairment | (5,231,182 | ) |  | (4,791,534 | )
Net oil and natural gas properties capitalized costs | 7,897,602 |  |  | 4,867,155 |
Land | 17,927 |  |  | 14,196 |
Non-oil and natural gas equipment(2) | 643,370 |  |  | 668,391 |
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.
Capitalized Costs of Unproved Properties Excluded from Amortization | The following table summarizes the costs, by year incurred, related to unproved properties and pipe inventory, which were excluded from oil and natural gas properties subject to amortization at December 31, 2012 (in thousands):
|  |  | Year Cost Incurred
| Total |  | 2012 |  | 2011 |  | 2010 |  | 2009 and Prior
Property acquisition | $ | 856,290 |  |  | $ | 377,185 |  |  | $ | 76,754 |  |  | $ | 286,758 |  |  | $ | 115,593 |
Exploration(1) | 81,940 |  |  | 57,579 |  |  | 5,846 |  |  | 6,285 |  |  | 12,230 |
Total costs incurred | $ | 938,230 |  |  | $ | 434,764 |  |  | $ | 82,600 |  |  | $ | 293,043 |  |  | $ | 127,823 |
____________________
(1) | Includes $72.4 million of pipe inventory costs incurred ($54.9 million in 2012, $2.3 million in 2011, $5.1 million in 2010 and $10.1 million in 2009 and prior years).

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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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- Definition Tabular disclosure of the capitalized costs of unproved properties and major development projects that are excluded from capitalized costs being amortized. This includes the total costs excluded and, at a minimum, these categories of costs: acquisition costs, exploration costs, development costs in the case of significant development projects, and capitalized interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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