Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 1,068,977		$ 1,028,233
Less: accumulated depreciation and amortization	487,436		474,071
Property, plant and equipment, net	581,541		554,162
Depreciation expense	14,500	$ 13,000
Land
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 3,771		3,771
Land improvements
Property, plant and equipment [Abstract]
Estimated Useful Lives	10 years
Total property, plant and equipment	$ 3,483		3,478
Buildings and structures
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 96,504		96,323
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	45 years
Cable and fiber
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 476,573		453,405
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	$ 383,619		391,293
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	$ 963,950		948,270
Plant under construction
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 105,027		$ 79,963