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Property and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2013
Property and Equipment | Property and equipment consisted of the following at December 31, 2013 and 2012 (in thousands):
|  | 2013 |  |  | 2012 |
Equipment |  | $ | 5,749,975 |  |  | $ | 5,387,490 |
Oil and natural gas properties |  |  | 183,571 |  |  |  | 156,834 |
Buildings |  |  | 80,050 |  |  |  | 66,490 |
Land |  |  | 12,054 |  |  |  | 10,413 |
|  |  | 6,025,650 |  |  |  | 5,621,227 |
Less accumulated depreciation and depletion |  |  | (2,390,109 | ) |  |  | (2,005,844 | )
Property and equipment, net |  | $ | 3,635,541 |  |  | $ | 3,615,383 |
Summary of Depreciation, Depletion, Amortization and Impairment Expense related to Property and Equipment and Intangible Assets | Depreciation, depletion, amortization and impairment — The following table summarizes depreciation, depletion, amortization and impairment expense related to property and equipment and intangible assets for 2013, 2012 and 2011 (in thousands):
|  | 2013 |  |  | 2012 |  |  | 2011 |
Depreciation and impairment expense |  | $ | 573,106 |  |  | $ | 502,953 |  |  | $ | 419,183 |
Amortization expense |  |  | 3,993 |  |  |  | 4,110 |  |  |  | 4,110 |
Depletion expense |  |  | 20,370 |  |  |  | 19,551 |  |  |  | 13,986 |
Total |  | $ | 597,469 |  |  | $ | 526,614 |  |  | $ | 437,279 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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