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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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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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