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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment as of December 31, 2020 and 2019 consisted of the following amounts (in thousands):
 20202019
Machinery and equipment$176,031 $166,087 
Vehicles61,624 59,116 
Furniture and fixtures23,724 22,123 
Computer hardware/software111,846 104,916 
Land, buildings and leasehold improvements124,309 113,020 
Construction in progress7,754 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 
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(1)Finance lease right-of-use assets are recorded net of accumulated amortization.