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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 1,561,048	$ 1,498,691
Less: accumulated amortization and depreciation	858,036	797,177
Property, plant and equipment, net	703,012	701,514
Land
Property, plant and equipment [Abstract]
Total property, plant and equipment	7,485	6,976
Buildings and structures
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 239,772	232,730
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	$ 354,819	334,260
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	40 years
Equipment and software
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 887,584	867,898
Equipment and software | Minimum
Property, plant and equipment [Abstract]
Estimated useful lives	3 years
Equipment and software | Maximum
Property, plant and equipment [Abstract]
Estimated useful lives	20 years
Plant in service
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 1,489,660	1,441,864
Plant under construction
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 71,388	$ 56,827

X

- Definition

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

+ References

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- Definition

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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+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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