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FIXED ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fixed Assets |  |  |
Total plant in service | $ 1,899,463 | $ 1,841,295 |
Total property, plant, and equipment | 2,092,278 | 1,977,978 |
Less: Accumulated depreciation | (1,011,619) | (922,024) |
Net fixed assets | 1,080,659 | 1,055,954 |
Depreciation and amortization | 141,600 | 135,100 | $ 102,700
Capital expenditure grants | 31,900 | 2,900 |
Capitalized implementation costs | 8,100 | 5,600 |
Amortization of implementation costs | $ 2,200 | 1,900 |
Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 3 years |  |
Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 39 years |  |
Telecommunications equipment and towers |  |  |
Fixed Assets |  |  |
Total plant in service | $ 1,539,533 | 1,479,633 |
Capital leased assets, cost | 36,100 | 26,600 |
Capital leased assets, net | $ 8,700 | $ 13,700 |
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 |
Office and computer equipment |  |  |
Fixed Assets |  |  |
Total plant in service | $ 148,693 | $ 151,804 |
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 | $ 138,243 | $ 136,145 |
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 | $ 27,480 | $ 27,879 |
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 | $ 22,424 | $ 22,934 |
Land |  |  |
Fixed Assets |  |  |
Total plant in service | 11,652 | 11,308 |
Furniture and fixtures |  |  |
Fixed Assets |  |  |
Total plant in service | $ 11,438 | $ 11,592 |
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 | $ 192,815 | $ 136,683 |

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