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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The following is a summary of property, plant and equipment at December 31, 2017 and 2016 (in thousands):
|  |  | December 31,
| Estimated Useful Lives in Years |  | 2017 |  | 2016
Land | — |  | $ | 15,314 |  |  | $ | 15,730 |
Land improvements (1) | 8-15 |  | 14,594 |  |  | 9,379 |
Buildings and improvements (1) | 39 |  | 119,380 |  |  | 73,211 |
Rental machinery and equipment | 7 |  | 898,146 |  |  | 933,667 |
Machinery and equipment - other | 7 |  | 55,049 |  |  | 60,182 |
Furniture, fixtures and computers | 5 |  | 27,259 |  |  | 19,073 |
Automobiles and other vehicles | 5 |  | 29,971 |  |  | 36,796 |
Aircraft | 7 |  | — |  |  | 16,267 |
Leasehold improvements (1) | 7-15, or lease term if shorter |  | 10,030 |  |  | 8,027 |
Construction in progress - machinery and equipment and buildings (1) | — |  | 61,836 |  |  | 120,937 |
|  |  | 1,231,579 |  |  | 1,293,269 |
Less: Accumulated depreciation |  |  | (761,933 | ) |  | (726,245 | )
Total property, plant and equipment, net |  |  | $ | 469,646 |  |  | $ | 567,024 |
(1) | See Note 13 - Related Party Transactions for additional information.
During the third quarter of 2017, we committed to sell certain buildings in the Middle East region and determined those assets met the criteria to be classified as held for sale in our consolidated balance sheet. As a result, we reclassified the buildings, with a net book value of $4.1 million, from property, plant and equipment to assets held for sale and recognized a $0.3 million loss. No impairments were recognized during the years ended December 31, 2017, 2016 or 2015. The following table presents the depreciation and amortization associated with each line for the periods ended December 31, 2017, 2016 and 2015 (in thousands):
| December 31,
| 2017 |  | 2016 |  | 2015
Cost of revenues |  |  |  |  |  |
Services |  | $ | 102,212 |  |  | $ | 101,260 |  |  | $ | 95,825 |
Products |  | 4,971 |  |  | 4,254 |  |  | 4,233 |
General and administrative expenses |  | 14,919 |  |  | 8,701 |  |  | 8,904 |
Total |  | $ | 122,102 |  |  | $ | 114,215 |  |  | $ | 108,962 |

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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 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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