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Property, Plant and Equipment, net | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Property, plant and equipment consisted of the following:
| December 31,
(in thousands) | 2017 |  | 2016
Land | $ | 33,087 |  |  | $ | 32,127 |
Buildings and site improvements | 212,817 |  |  | 183,882 |
Leasehold improvements | 4,684 |  |  | 5,550 |
Machinery and equipment | 300,334 |  |  | 248,861 |
| 550,922 |  |  | 470,420 |
Less accumulated depreciation and amortization | (299,907 | ) |  | (273,302 | )
| 251,015 |  |  | 197,118 |
Capital projects in progress | 22,005 |  |  | 35,692 |
| $ | 273,020 |  |  | $ | 232,810 |
Included in property, plant and equipment at December 31, 2017 and 2016, are fully depreciated assets with an original cost of $189.9 million and $166.7 million, respectively. These fully depreciated assets are still in use in the Company’s operations. The Company capitalizes certain development costs associated with internal use software, including external direct costs of materials and services and payroll costs for employees devoting time to a software project. As of December 31, 2017 and 2016, depreciable capitalized software development costs were $20.5 million and $4.6 million, respectively, and included in capital projects in progress at December 31, 2017 and 2016, were software in development costs of $12.2 million and $13.5 million, respectively. The approximate $29.0 million increase in buildings and site improvements was primarily related to $21.2 million improvement costs associated with the manufacturing facility in West Chicago and the expansion of the McKinney facility. Depreciation expense, including depreciation of equipment and software acquired through capital lease arrangements, was $27.3 million, $21.6 million and $20.4 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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