Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 2,179,164	$ 1,980,111
Less: accumulated depreciation and amortization	(607,438)	(541,573)
Property, plant and equipment, net	1,571,726	1,438,538
Total plant in service
Property, plant and equipment [Abstract]
Total property, plant and equipment	1,943,607	1,772,683
Land
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 4,498	4,514
Land improvements
Property, plant and equipment [Abstract]
Estimated Useful Lives	10 years
Total property, plant and equipment	$ 3,677	3,717
Buildings and structures
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 53,924	52,706
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	$ 1,449,956	1,294,689
Cable and fiber \| Minimum
Property, plant and equipment [Abstract]
Estimated Useful Lives	12 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	$ 431,552	417,057
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	12 years
Plant under construction
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 235,557	$ 207,428