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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2018
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 |  | December 31, 2018 |  | December 31, 2017
Land |  |  | $ | 6,723 |  |  | $ | 6,418 |
Buildings and structures | 10 - 40 years |  | 213,657 |  |  | 195,540 |
Cable and wire | 4 - 40 years |  | 309,928 |  |  | 286,999 |
Equipment and software | 2 - 17 years |  | 791,401 |  |  | 730,228 |
Plant in service |  |  | 1,321,709 |  |  | 1,219,185 |
Plant under construction |  |  | 81,409 |  |  | 62,202 |
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 expense for the years ended December 31, 2018, 2017, and 2016, was $142.1 million, $151.1 million, and 124.0 million, respectively. The Company leases fiber under indefeasible right of use agreements (IRUs). IRU's totaled $5.6 million and $5.9 million at December 31, 2018 and 2017 and were classified as capital lease agreements within property, plant and equipment. At December 31, 2018 and 2017, the Company had unamortized capitalized software costs for software in service of $27.8 million and $28.0 million, respectively. At December 31, 2018 and 2017, plant under construction consisted primarily of equipment and software, which was not placed into service.

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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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