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FIXED ASSETS | 12 Months Ended
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Dec. 31, 2017
FIXED ASSETS: |
FIXED ASSETS: | 7. FIXED ASSETS: As of December 31, 2017 and 2016, property, plant and equipment consisted of the following (in thousands):
|  | Useful Life |  |  |  |  |  |  |
|  | (in Years) |  | 2017 |  | 2016 |
Telecommunications equipment and towers |  | 5 -15 |  |  |  | $ | 774,548 |  | $ | 802,415 |
Solar assets |  | 20-23 |  |  |  |  | 113,218 |  |  | 115,932 |
Office and computer equipment |  | 3 -10 |  |  |  |  | 76,706 |  |  | 44,147 |
Buildings |  | 15-39 |  |  |  |  | 48,058 |  |  | 43,609 |
Transportation vehicles |  | 3 -10 |  |  |  |  | 12,221 |  |  | 12,043 |
Leasehold improvements |  | Shorter of useful life or lease term |  |  |  |  | 2,864 |  |  | 325 |
Land |  | — |  |  |  |  | 12,516 |  |  | 10,242 |
Furniture and fixtures |  | 5 -10 |  |  |  |  | 6,674 |  |  | 7,657 |
Total property, plant and equipment |  |  |  |  |  |  | 1,046,805 |  |  | 1,036,370 |
Construction in progress |  |  |  |  |  |  | 123,001 |  |  | 101,992 |
Total property, plant and equipment |  |  |  |  |  |  | 1,169,806 |  |  | 1,138,362 |
Less: Accumulated depreciation |  |  |  |  |  |  | (526,660) |  |  | (490,650) |
Net fixed assets |  |  |  |  |  | $ | 643,146 |  |  | 647,712 |
Depreciation and amortization of fixed assets, using the straight‑line method over the assets’ estimated useful life, for the years ended December 31, 2017, 2016 and 2015 was $83.3 million, $73.3 million and $55.9 million, respectively. Included within telecommunication equipment and towers are certain right to use assets under capital lease with a cost of $30.0 million and $13.8 million and net book value of and $24.4 million and $12.4 million, as of December 31, 2017 and 2016, respectively. Remaining amounts due under the IRUs are $0.6 million and $1.2 million as of December 31, 2017 and 2016, respectively. During the year ended December 31, 2015, we sold certain network assets and telecommunications licenses in our U.S. Telecom segment and recognized a gain on such disposition of $2.8 million. For the years ended December 31, 2017, 2016 and 2015, amounts of capital expenditures were offset by grants of $1.5 million, $2.3 million and $2.6 million, respectively.

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- References No definition available. + Details
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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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