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FIXED ASSETS | 12 Months Ended
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Dec. 31, 2014
FIXED ASSETS: |
FIXED ASSETS: | 6. FIXED ASSETS: As of December 31, 2013 and 2014, property, plant and equipment consisted of the following (in thousands):
|  | Useful Life (in Years) |  | 2013 |  | 2014 |
Telecommunications equipment and towers |  |  | 5 - 15 |  | $ | 471,265 |  | $ | 514,814 |
Solar assets |  |  | 20 - 23 |  |  | — |  |  | 111,446 |
Office and computer equipment |  |  | 3 - 10 |  |  | 46,680 |  |  | 46,757 |
Buildings |  |  | 15 - 39 |  |  | 18,002 |  |  | 18,079 |
Transportation vehicles |  |  | 3 - 10 |  |  | 6,984 |  |  | 7,589 |
Leasehold improvements |  |  | Shorter of useful life or lease term |  |  | 11,380 |  |  | 11,494 |
Land |  |  | — |  |  | 1,162 |  |  | 1,146 |
Furniture and fixtures |  |  | 5 - 10 |  |  | 5,778 |  |  | 8,110 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total plant in service |  |  |  |  |  | 561,251 |  |  | 719,435 |
Construction in progress |  |  |  |  |  | 45,661 |  |  | 43,982 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total property, plant, and equipment in service |  |  |  |  |  | 606,912 |  |  | 763,417 |
Less: Accumulated depreciation |  |  |  |  |  | (352,280 | ) |  | (393,835 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net fixed assets |  |  |  |  | $ | 254,632 |  |  | 369,582 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation and amortization of fixed assets, using the straight-line method over the assets' estimated useful life, for the years ended December 31, 2012, 2013 and 2014 was $50.0 million, $48.3 million and $50.3 million, respectively. For the years ended December 31, 2012, 2013 and 2014, amounts of capital expenditures were offset by grants of $30.6 million, $31.6 million and $2.3 million, respectively.

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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 -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 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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