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Property and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property Plant And Equipment [Abstract] |
Property and Equipment | Property and equipment consisted of the following at December 31, 2017 and 2016 (in thousands):
|  | 2017 |  |  | 2016 |
Equipment |  | $ | 8,066,404 |  |  | $ | 6,809,129 |
Oil and natural gas properties |  |  | 211,566 |  |  |  | 201,568 |
Buildings |  |  | 185,475 |  |  |  | 97,029 |
Land |  |  | 26,593 |  |  |  | 22,270 |
Total property and equipment |  |  | 8,490,038 |  |  |  | 7,129,996 |
Less accumulated depreciation, depletion and impairment |  |  | (4,235,308 | ) |  |  | (3,721,033 | )
Property and equipment, net |  | $ | 4,254,730 |  |  | $ | 3,408,963 |
Summary of Depreciation, Depletion, Amortization and Impairment Expense related to Property and Equipment and Intangible Assets and Liabilities | Depreciation, depletion, amortization and impairment — The following table summarizes depreciation, depletion, amortization and impairment expense related to property and equipment and intangible assets and liabilities for 2017, 2016 and 2015 (in thousands):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Depreciation and impairment expense |  | $ | 753,510 |  |  | $ | 657,571 |  |  | $ | 845,543 |
Amortization expense |  |  | 21,764 |  |  |  | 3,643 |  |  |  | 3,643 |
Depletion expense |  |  | 8,067 |  |  |  | 7,220 |  |  |  | 15,573 |
Total |  | $ | 783,341 |  |  | $ | 668,434 |  |  | $ | 864,759 |

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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 + Details
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