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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 988,256 | $ 868,827
Less: accumulated amortization and depreciation | 462,457 | 428,400
Property, plant and equipment, net | 525,799 | 440,427
Land |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 3,771 | 3,909
Land improvements |  |
Property, plant and equipment [Abstract] |  |
Estimated Useful Lives | 10 years |
Total property, plant and equipment | $ 3,141 | 2,910
Buildings and structures |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 94,539 | 91,335
Buildings and structures | Minimum |  |
Property, plant and equipment [Abstract] |  |
Estimated Useful Lives | 10 years |
Buildings and structures | Maximum |  |
Property, plant and equipment [Abstract] |  |
Estimated Useful Lives | 40 years |
Cable and fiber |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 428,055 | 390,209
Cable and fiber | Minimum |  |
Property, plant and equipment [Abstract] |  |
Estimated Useful Lives | 15 years |
Cable and fiber | Maximum |  |
Property, plant and equipment [Abstract] |  |
Estimated Useful Lives | 30 years |
Equipment and software |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 374,019 | 331,047
Equipment and software | Minimum |  |
Property, plant and equipment [Abstract] |  |
Estimated Useful Lives | 4 years |
Equipment and software | Maximum |  |
Property, plant and equipment [Abstract] |  |
Estimated Useful Lives | 8 years |
Plant in service |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 903,525 | 819,410
Plant under construction |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 84,731 | $ 49,417

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