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PROPERTY, PLANT AND EQUIPMENT
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following (in thousands):
September 30, 2021December 31, 2020
 (unaudited) 
Land$5,755 $5,805 
Buildings and leasehold improvements57,779 57,632 
Machinery and equipment304,803 302,886 
Furniture and fixtures11,666 11,450 
Capitalized ERP system development costs45,917 45,917 
Computers and computer software21,781 20,508 
Automobiles4,327 4,518 
Construction in progress12,830 8,329 
Total464,858 457,045 
Accumulated depreciation(303,989)(286,736)
Property, plant and equipment, net$160,869 $170,309 
Included in the table above are assets under finance leases of $6.7 million and $5.7 million, net of accumulated amortization of $1.4 million and $0.9 million as of September 30, 2021 and December 31, 2020, respectively. Depreciation expense for the three months ended September 30, 2021 and 2020 was $6.7 million and $7.9 million, respectively. Depreciation expense for the nine months ended September 30, 2021 and 2020 was $21.0 million and $23.8 million, respectively.