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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, plant and equipment [Abstract] |  |  |
Total property, plant and equipment | $ 1,403,118 | $ 1,281,387 |
Less accumulated amortization and depreciation | 701,759 | 595,060 |
Property, plant and equipment, net | 701,359 | 686,327 |
Depreciation | 142,111 | 151,063 | $ 123,995
Capital lease agreements | 5,600 | 5,900 |
Unamortized capitalized software costs | 27,800 | 28,000 |
Land |  |  |
Property, plant and equipment [Abstract] |  |  |
Total property, plant and equipment | 6,723 | 6,418 |
Buildings and structures |  |  |
Property, plant and equipment [Abstract] |  |  |
Total property, plant and equipment | $ 213,657 | 195,540 |
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 wire |  |  |
Property, plant and equipment [Abstract] |  |  |
Total property, plant and equipment | $ 309,928 | 286,999 |
Cable and wire | Minimum |  |  |
Property, plant and equipment [Abstract] |  |  |
Estimated useful lives | 4 years |  |
Cable and wire | Maximum |  |  |
Property, plant and equipment [Abstract] |  |  |
Estimated useful lives | 40 years |  |
Equipment and software |  |  |
Property, plant and equipment [Abstract] |  |  |
Total property, plant and equipment | $ 791,401 | 730,228 |
Equipment and software | Minimum |  |  |
Property, plant and equipment [Abstract] |  |  |
Estimated useful lives | 2 years |  |
Equipment and software | Maximum |  |  |
Property, plant and equipment [Abstract] |  |  |
Estimated useful lives | 17 years |  |
Plant in service |  |  |
Property, plant and equipment [Abstract] |  |  |
Total property, plant and equipment | $ 1,321,709 | 1,219,185 |
Plant under construction |  |  |
Property, plant and equipment [Abstract] |  |  |
Total property, plant and equipment | $ 81,409 | $ 62,202 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + 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 (c) -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 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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