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PROPERTY, PLANT AND EQUIPMENT
 6 Months Ended
Jun. 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):
June 30, 2021December 31, 2020
 (unaudited) 
Land$5,796 $5,805 
Buildings and leasehold improvements58,113 57,632 
Machinery and equipment306,557 302,886 
Furniture and fixtures11,791 11,450 
Capitalized ERP system development costs45,917 45,917 
Computers and computer software21,076 20,508 
Automobiles4,396 4,518 
Construction in progress11,158 8,329 
Total464,804 457,045 
Accumulated depreciation and amortization(300,112)(286,736)
Property, plant and equipment, net$164,692 $170,309 
Included in the table above are assets under finance leases of $6.1 million and $4.8 million, net of accumulated amortization of $1.2 million and $0.9 million as of June 30, 2021 and December 31, 2020, respectively. Depreciation expense for the three months ended June 30, 2021 and 2020 was $6.8 million and $7.8 million, respectively. Depreciation expense for the six months ended June 30, 2021 and 2020 was $14.3 million and $15.9 million, respectively.