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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 |  |

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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 No definition available. + Details
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