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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2013
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2013 |  | 2012
Oil and natural gas properties |  |  |
Proved(1) | $ | 10,972,816 |  |  | $ | 12,262,921 |
Unproved | 531,606 |  |  | 865,863 |
Total oil and natural gas properties | 11,504,422 |  |  | 13,128,784 |
Less accumulated depreciation, depletion and impairment | (5,762,969 | ) |  | (5,231,182 | )
Net oil and natural gas properties capitalized costs | 5,741,453 |  |  | 7,897,602 |
Land | 18,423 |  |  | 17,927 |
Non-oil and natural gas equipment(2) | 600,603 |  |  | 643,370 |
Buildings and structures(3) | 233,405 |  |  | 205,349 |
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.
Cumulative full cost ceiling limitation impairment charges of $3.5 billion at both December 31, 2013 and 2012 were included in accumulated depreciation, depletion and impairment for oil and natural gas properties in the accompanying consolidated balance sheets. There was no full cost ceiling impairment during any of the years ended December 31, 2013, 2012 or 2011. See Note 9 for discussion of impairment of other property, plant and equipment. The average rates used for depreciation and depletion of oil and natural gas properties were $16.81 per Boe in 2013, $16.93 per Boe in 2012 and $13.57 per Boe in 2011. Century Plant Construction Costs Included in proved oil and natural gas properties at December 31, 2013 and 2012 is approximately $180.0 million of costs in excess of contracted and reimbursed amounts incurred by the Company during construction of the Century Plant pursuant to an agreement with Occidental Petroleum Corporation (“Occidental”). Due to the high-CO 2 content of the Company’s reserves in the Piñon Field and the absence of adequate processing capacity in the Piñon Field area, construction of a large-scale processing facility, such as the Century Plant, was necessary for the development of the Company’s natural gas reserves in that area. The Company entered into the construction agreement and a related treating agreement with Occidental solely to facilitate the development of its reserves in the Piñon Field and greater West Texas Overthrust area and, accordingly, has recorded these unreimbursed costs as development costs within its full cost pool. See Note 16 for discussion of the related treating agreement. Costs 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, 2013 (in thousands):
|  |  | Year Cost Incurred
| Total |  | 2013 |  | 2012 |  | 2011 |  | 2010 and Prior
Property acquisition | $ | 515,849 |  |  | $ | 114,252 |  |  | $ | 291,999 |  |  | $ | 34,164 |  |  | $ | 75,434 |
Exploration(1) | 61,327 |  |  | 48,764 |  |  | 5,479 |  |  | 3,598 |  |  | 3,486 |
Total costs incurred | $ | 577,176 |  |  | $ | 163,016 |  |  | $ | 297,478 |  |  | $ | 37,762 |  |  | $ | 78,920 |
____________________
(1) | Includes $45.6 million of pipe inventory costs incurred ($42.6 million in 2013, $2.8 million in 2012 and $0.2 million in 2010 and prior years).
The Company expects to complete the majority of the evaluation activities within 10 years from the applicable date of acquisition, contingent on the Company’s capital expenditures and drilling program. In addition, the Company’s internal engineers evaluate all properties on at least an annual basis.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 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 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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