Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 2,298,671	$ 2,240,427
Less: accumulated depreciation and amortization	(669,463)	(638,818)
Property, plant and equipment, net	1,629,208	1,601,609
Total plant in service
Property, plant and equipment [Abstract]
Total property, plant and equipment	2,117,161	2,059,367
Land
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 4,493	4,498
Land improvements
Property, plant and equipment [Abstract]
Estimated Useful Lives	10 years
Total property, plant and equipment	$ 3,630	3,699
Buildings and structures
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 54,539	54,562
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	$ 1,570,116	1,519,669
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	$ 484,383	476,939
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	$ 181,510	$ 181,060