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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Property, plant and equipment [Abstract] |  |  |  |
Total property, plant and equipment | $ 1,471,159 | $ 1,471,159 |  | $ 1,403,118
Less accumulated amortization and depreciation | 782,643 | 782,643 |  | 701,759
Property, plant and equipment, net | 688,516 | 688,516 | $ 703,148 | 701,359
Depreciation expense | 800 | 800 |  |
Land |  |  |  |
Property, plant and equipment [Abstract] |  |  |  |
Total property, plant and equipment | 6,936 | 6,936 |  | 6,723
Buildings and structures |  |  |  |
Property, plant and equipment [Abstract] |  |  |  |
Total property, plant and equipment | 231,962 | 231,962 |  | 213,657
Cable and fiber |  |  |  |
Property, plant and equipment [Abstract] |  |  |  |
Total property, plant and equipment | 321,963 | 321,963 |  | 309,928
Equipment and software |  |  |  |
Property, plant and equipment [Abstract] |  |  |  |
Total property, plant and equipment | 839,624 | 839,624 |  | 791,401
Plant in service |  |  |  |
Property, plant and equipment [Abstract] |  |  |  |
Total property, plant and equipment | 1,400,485 | 1,400,485 |  | 1,321,709
Plant under construction |  |  |  |
Property, plant and equipment [Abstract] |  |  |  |
Total property, plant and equipment | $ 70,674 | $ 70,674 |  | $ 81,409
Minimum | Buildings and structures |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful life (in years) |  | 10 years |  |
Minimum | Cable and fiber |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful life (in years) |  | 15 years |  |
Minimum | Equipment and software |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful life (in years) |  | 3 years |  |
Maximum | Buildings and structures |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful life (in years) |  | 40 years |  |
Maximum | Cable and fiber |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful life (in years) |  | 40 years |  |
Maximum | Equipment and software |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful life (in years) |  | 20 years |  |

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