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FIXED ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fixed Assets |  |  |
Total plant in service | $ 1,201,871 | $ 1,190,375 |
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 | 86,500 | 86,900 | $ 83,000
Capital expenditure grants | 16,300 | 3,100 |
Capitalized implementation costs | 5,600 | 3,600 |
Amortization of implementation costs | $ 700 | 200 |
Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 3 years |  |
Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 39 years |  |
Telecommunications equipment and towers |  |  |
Fixed Assets |  |  |
Total plant in service | $ 1,012,457 | 979,028 |
Capital leased assets, cost | 25,400 | 25,900 |
Capital leased assets, net | $ 15,900 | $ 16,500 |
Telecommunications equipment and towers | Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 5 years | 5 years |
Telecommunications equipment and towers | Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 15 years | 15 years |
Solar assets |  |  |
Fixed Assets |  |  |
Total plant in service |  | $ 40,043 |
Solar assets | Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 20 years | 20 years |
Solar assets | Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 23 years | 23 years |
Office and computer equipment |  |  |
Fixed Assets |  |  |
Total plant in service | $ 87,427 | $ 82,630 |
Office and computer equipment | Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 3 years | 3 years |
Office and computer equipment | Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 10 years | 10 years |
Buildings |  |  |
Fixed Assets |  |  |
Total plant in service | $ 52,048 | $ 48,565 |
Buildings | Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 15 years | 15 years |
Buildings | Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 39 years | 39 years |
Transportation vehicles |  |  |
Fixed Assets |  |  |
Total plant in service | $ 13,730 | $ 13,424 |
Transportation vehicles | Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 3 years | 3 years |
Transportation vehicles | Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 10 years | 10 years |
Leasehold improvements |  |  |
Fixed Assets |  |  |
Total plant in service | $ 16,709 | $ 2,316 |
Land |  |  |
Fixed Assets |  |  |
Total plant in service | 8,180 | 15,503 |
Furniture and fixtures |  |  |
Fixed Assets |  |  |
Total plant in service | $ 11,320 | $ 8,866 |
Furniture and fixtures | Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 5 years | 5 years |
Furniture and fixtures | Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 10 years | 10 years |
Construction in progress |  |  |
Fixed Assets |  |  |
Total property, plant, and equipment | $ 50,909 | $ 47,180 |

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