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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 1,523,715 | $ 1,498,691
Less: accumulated amortization and depreciation | 827,795 | 797,177
Property, plant and equipment, net | 695,920 | 701,514
Land |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | 7,143 | 6,976
Buildings and structures |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 238,728 | 232,730
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 | $ 348,658 | 334,260
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 | 40 years |
Equipment and software |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 870,089 | 867,898
Equipment and software | Minimum |  |
Property, plant and equipment [Abstract] |  |
Estimated useful lives | 3 years |
Equipment and software | Maximum |  |
Property, plant and equipment [Abstract] |  |
Estimated useful lives | 20 years |
Plant in service |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 1,464,618 | 1,441,864
Plant under construction |  |
Property, plant and equipment [Abstract] |  |
Total property, plant and equipment | $ 59,097 | $ 56,827

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