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Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2019
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consisted of the following:
(in thousands) |  | Estimated Useful Lives |  | September 30, 2019 |  | December 31, 2018
Land |  |  |  | $ | 6,936 |  |  | $ | 6,723 |
Buildings and structures |  | 10 - 40 years |  | 231,962 |  |  | 213,657 |
Cable and fiber |  | 15 - 40 years |  | 321,963 |  |  | 309,928 |
Equipment and software |  | 3 - 20 years |  | 839,624 |  |  | 791,401 |
Plant in service |  |  |  | 1,400,485 |  |  | 1,321,709 |
Plant under construction |  |  |  | 70,674 |  |  | 81,409 |
Total property, plant and equipment |  |  |  | 1,471,159 |  |  | 1,403,118 |
Less: accumulated amortization and depreciation |  |  |  | 782,643 |  |  | 701,759 |
Property, plant and equipment, net |  |  |  | $ | 688,516 |  |  | $ | 701,359 |
The Company prospectively changed the estimated useful life of certain tower, antenna, and fiber assets during 2019 based on the Company's experience as well as observable examples in the industry. Depreciation expense was approximately $0.8 million lower as a result for the three and nine months ended September 30, 2019.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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