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PROPERTY, PLANT AND EQUIPMENT
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
A summary of property, plant and equipment as of March 31, 2022 and December 31, 2021 is as follows (in thousands):
March 31, 2022December 31, 2021
 (unaudited) 
Land$5,208 $5,743 
Buildings and leasehold improvements57,902 58,972 
Machinery and equipment304,018 306,366 
Furniture and fixtures11,555 11,642 
Capitalized ERP system development costs45,917 45,917 
Computers and computer software22,281 22,243 
Automobiles4,326 4,356 
Construction in progress20,938 16,565 
Total472,145 471,804 
Accumulated depreciation(311,956)(310,445)
Property, plant and equipment, net$160,189 $161,359 
Included in the table above are assets under finance leases of $6.7 million and $6.7 million, net of accumulated amortization of $1.7 million and $1.6 million as of March 31, 2022 and December 31, 2021, respectively. Depreciation expense for the three months ended March 31, 2022 and 2021 was $6.5 million and $7.5 million, respectively.