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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 1,449,095		$ 1,403,118
Less accumulated amortization and depreciation	753,370		701,759
Property, plant and equipment, net	695,725	$ 703,148	701,359
Land
Property, plant and equipment [Abstract]
Total property, plant and equipment	6,936		6,723
Buildings and structures
Property, plant and equipment [Abstract]
Total property, plant and equipment	227,825		213,657
Cable and fiber
Property, plant and equipment [Abstract]
Total property, plant and equipment	319,750		309,928
Equipment and software
Property, plant and equipment [Abstract]
Total property, plant and equipment	813,393		791,401
Plant in service
Property, plant and equipment [Abstract]
Total property, plant and equipment	1,367,904		1,321,709
Plant under construction
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 81,191		$ 81,409
Minimum | Buildings and structures
Property, Plant and Equipment [Line Items]
Useful life (in years)	10 years
Minimum | Cable and fiber
Property, Plant and Equipment [Line Items]
Useful life (in years)	4 years
Minimum | Equipment and software
Property, Plant and Equipment [Line Items]
Useful life (in years)	2 years
Maximum | Buildings and structures
Property, Plant and Equipment [Line Items]
Useful life (in years)	40 years
Maximum | Cable and fiber
Property, Plant and Equipment [Line Items]
Useful life (in years)	40 years
Maximum | Equipment and software
Property, Plant and Equipment [Line Items]
Useful life (in years)	17 years

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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+ 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.

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