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Property and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2011
Property and Equipment | Property and equipment consisted of the following at December 31, 2011 and 2010 (in thousands):
|  | 2011 |  |  | 2010 |
Equipment |  | $ | 4,730,925 |  |  | $ | 3,972,891 |
Oil and natural gas properties |  |  | 131,812 |  |  |  | 110,749 |
Buildings |  |  | 64,090 |  |  |  | 61,425 |
Land |  |  | 11,467 |  |  |  | 11,074 |
|  |  | 4,938,294 |  |  |  | 4,156,139 |
Less accumulated depreciation and depletion |  |  | (1,771,028 | ) |  |  | (1,535,239 | )
Property and equipment, net |  | $ | 3,167,266 |  |  | $ | 2,620,900 |
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 2011, 2010 and 2009 (in millions):
|  | 2011 |  |  | 2010 |  |  | 2009 |
Depreciation and impairment expense |  | $ | 419.2 |  |  | $ | 322.3 |  |  | $ | 280.6 |
Amortization expense |  |  | 4.1 |  |  |  | 1.0 |  |  |  | — |
Depletion expense |  |  | 14.0 |  |  |  | 10.2 |  |  |  | 9.2 |
Total |  | $ | 437.3 |  |  | $ | 333.5 |  |  | $ | 289.8 |

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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 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 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-Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 4: 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 + Details
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