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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment as of December 31, 2020 and 2019 consisted of the following amounts (in thousands):
| 2020 |  | 2019
Machinery and equipment | $ | 176,031 |  |  | $ | 166,087 |
Vehicles | 61,624 |  |  | 59,116 |
Furniture and fixtures | 23,724 |  |  | 22,123 |
Computer hardware/software | 111,846 |  |  | 104,916 |
Land, buildings and leasehold improvements | 124,309 |  |  | 113,020 |
Construction in progress | 7,754 |  |  | 10,236 |
Finance lease right-of-use assets (1) | 9,638 |  |  | 9,609 |
| 514,926 |  |  | 485,107 |
Accumulated depreciation and amortization | (356,499) |  |  | (328,920) |
| $ | 158,427 |  |  | $ | 156,187 |
_________________ (1)Finance lease right-of-use assets are recorded net of accumulated amortization. Depreciation and amortization expense related to property, plant and equipment, including finance leases, was $46.7 million, $43.9 million, and $38.5 million for the years ended December 31, 2020, 2019, and 2018, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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