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FIXED ASSETS | 12 Months Ended
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Dec. 31, 2020
FIXED ASSETS: |
FIXED ASSETS: | 7. FIXED ASSETS: As of December 31, 2020 and 2019, property, plant and equipment consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Useful Life | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | (in Years) |  | 2020 |  | 2019 |
Telecommunications equipment and towers |  | 5 -15 | ​ | $ | 1,012,457 | ​ | $ | 979,028 | ​
Solar assets | ​ | 20-23 | ​ | ​ | - | ​ | ​ | 40,043 | ​
Office and computer equipment |  | 3 -10 | ​ |  | 87,427 | ​ |  | 82,630 | ​
Buildings |  | 15-39 | ​ |  | 52,048 | ​ |  | 48,565 | ​
Transportation vehicles |  | 3 -10 | ​ |  | 13,730 | ​ |  | 13,424 | ​
Leasehold improvements |  | Shorter of useful life or lease term | ​ |  | 16,709 | ​ |  | 2,316 | ​
Land |  | — | ​ |  | 8,180 | ​ |  | 15,503 | ​
Furniture and fixtures |  | 5 -10 | ​ |  | 11,320 | ​ |  | 8,866 | ​
Total property, plant and equipment | ​ | ​ | ​ |  | 1,201,871 | ​ |  | 1,190,375 | ​
Construction in progress | ​ | ​ | ​ |  | 50,909 | ​ |  | 47,180 | ​
Total property, plant and equipment | ​ | ​ | ​ |  | 1,252,780 | ​ |  | 1,237,555 | ​
Less: Accumulated depreciation | ​ | ​ | ​ |  | (716,318) | ​ |  | (631,974) | ​
Net fixed assets | ​ | ​ | ​ | $ | 536,462 | ​ | $ | 605,581 | ​
​ Depreciation and amortization of fixed assets, using the straight-line method over the assets’ estimated useful life, for the years ended December 31, 2020, 2019 and 2018 was $86.5 million, $86.9 million and $83.0 million, respectively. Included within telecommunication equipment and towers are certain right to use assets under capital lease with a cost of $25.4 million and $25.9 million and net book value of and $15.9 million and $16.5 million, as of December 31, 2020 and 2019, respectively. For the years ended December 31, 2020 and 2019, the Company received capital expenditure grants of $16.3 million and $3.1 million, respectively. ​ The Company had $5.6 million and $3.6 million of capitalized implementation costs at December 31, 2020 and 2019, respectively. The Company amortized $0.7 and $0.2 million of implementation costs during the year ended December 31, 2020 and 2019, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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