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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment |
Major Components of Property, Plant and Equipment |
|  | December 31, |
|  | 2016 |  | 2015 |
|  | (In thousands) |
Land |  | $ | 46,319 |  | $ | 19,757 |
Buildings |  |  | 115,502 |  |  | 126,285 |
Drilling, workover and well-servicing rigs, and related equipment |  |  | 12,638,749 |  |  | 12,243,811 |
Marine transportation and supply vessels |  |  | — |  |  | 10,271 |
Oilfield hauling and mobile equipment |  |  | 274,137 |  |  | 286,838 |
Other machinery and equipment |  |  | 181,069 |  |  | 175,687 |
Oil and gas properties |  |  | 12,286 |  |  | 16,386 |
Construction-in-process (1) |  |  | 288,673 |  |  | 457,422 |
|  | $ | 13,556,735 |  | $ | 13,336,457 |
Less: accumulated depreciation and amortization |  |  | (7,289,152) |  |  | (6,308,655) |
|  | $ | 6,267,583 |  | $ | 7,027,802 |
| (1) |  | Relates primarily to amounts capitalized for new or substantially new drilling rigs and related equipment that were under construction and had not yet been placed in service as of December 31, 2016 or 2015.

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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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