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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 1,028,233	$ 1,028,233	$ 868,827
Less: accumulated amortization and depreciation	474,071	474,071	428,400
Property, plant and equipment, net	554,162	554,162	440,427
Property, plant and equipment impairment charges	6,000
Land
Property, plant and equipment [Abstract]
Total property, plant and equipment	3,771	$ 3,771	3,909
Land improvements
Property, plant and equipment [Abstract]
Estimated useful lives		10 years
Total property, plant and equipment	3,478	$ 3,478	2,910
Buildings and structures
Property, plant and equipment [Abstract]
Total property, plant and equipment	96,323	$ 96,323	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		45 years
Cable and fiber
Property, plant and equipment [Abstract]
Total property, plant and equipment	453,405	$ 453,405	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	391,293	$ 391,293	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	948,270	$ 948,270	819,410
Plant under construction
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 79,963	$ 79,963	$ 49,417

X

- Definition

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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