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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2017 and 2016 (in thousands):
| 2017 |  | 2016
Machinery and equipment | $ | 138,592 |  |  | $ | 133,455 |
Vehicles | 55,648 |  |  | 54,165 |
Furniture and fixtures | 20,195 |  |  | 21,513 |
Computer hardware/software | 95,716 |  |  | 87,416 |
Land, buildings and leasehold improvements | 92,145 |  |  | 90,215 |
Construction in progress | 6,779 |  |  | 7,544 |
| 409,075 |  |  | 394,308 |
Accumulated depreciation and amortization | (281,919 | ) |  | (266,357 | )
| $ | 127,156 |  |  | $ | 127,951 |
Depreciation and amortization expense related to property, plant and equipment, including capital leases, was $39.9 million, $38.9 million and $36.3 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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