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FIXED ASSETS (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Fixed Assets |  |  |
Total plant in service | $ 1,081,318 | $ 1,046,805 |
Total property, plant, and equipment | 1,188,916 | 1,169,806 |
Less: Accumulated depreciation | (562,064) | (526,660) |
Net fixed assets | 626,852 | 643,146 |
Depreciation and amortization | 83,000 | 83,300 | $ 73,300
Capital expenditures offset by grants | 0 | 1,500 | 2,300
Proceeds from sale of cell sites | $ 6,900 |  | $ 1,424
U.S. Telecom |  |  |
Fixed Assets |  |  |
Number of cell sites sold | item | 100 |  |
Proceeds from sale of cell sites | $ 24,000 |  |
Book value of disposed cell sites | 8,800 |  |
Gain on sale of cell sites | $ 15,200 |  |
Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 3 years |  |
Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 39 years |  |
Telecommunications equipment and towers |  |  |
Fixed Assets |  |  |
Total plant in service | $ 914,276 | 774,548 |
Capital leased assets, cost | 27,700 | 30,000 |
Capital leased assets, net | 20,200 | 24,400 |
Remaining amounts due under the Indefeasible rights of use | $ 1,300 | $ 600 |
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 | $ 57 | $ 113,218 |
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 | $ 77,085 | $ 76,706 |
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 | $ 48,900 | $ 48,058 |
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 | $ 15,039 | $ 12,221 |
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 | $ 2,033 | $ 2,864 |
Land |  |  |
Fixed Assets |  |  |
Total plant in service | 14,728 | 12,516 |
Furniture and fixtures |  |  |
Fixed Assets |  |  |
Total plant in service | $ 9,200 | $ 6,674 |
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 | $ 107,598 | $ 123,001 |

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