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FIXED ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fixed Assets |  |  |
Total plant in service | $ 1,046,805 | $ 1,036,370 |
Total property, plant, and equipment | 1,169,806 | 1,138,362 |
Less: Accumulated depreciation | (526,660) | (490,650) |
Net fixed assets | 643,146 | 647,712 |
Depreciation and amortization | 83,300 | 73,300 | $ 55,900
Gain on disposition of long-lived assets | (101) | (27) | 2,823
Capital expenditures offset by grants | $ 1,500 | 2,300 | 2,600
U.S. Telecom |  |  |
Fixed Assets |  |  |
Gain on disposition of long-lived assets |  |  | $ 2,800
Minimum |  |  |
Fixed Assets |  |  |
Useful Life | 3 years |  |
Maximum |  |  |
Fixed Assets |  |  |
Useful Life | 39 years |  |
Telecommunications equipment and towers |  |  |
Fixed Assets |  |  |
Total plant in service | $ 774,548 | 802,415 |
Capital leased assets, cost | 30,000 | 13,800 |
Capital leased assets, net | 24,400 | 12,400 |
Capital leased Assets, remaining amount due | $ 600 | $ 1,200 |
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 | $ 113,218 | $ 115,932 |
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 | $ 76,706 | $ 44,147 |
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 | $ 48,058 | $ 43,609 |
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 | $ 12,221 | $ 12,043 |
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 | $ 2,864 | $ 325 |
Land |  |  |
Fixed Assets |  |  |
Total plant in service | 12,516 | 10,242 |
Furniture and fixtures |  |  |
Fixed Assets |  |  |
Total plant in service | $ 6,674 | $ 7,657 |
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 | $ 123,001 | $ 101,992 |

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