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Property, Plant & Equipment (Tables)
9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment, net consisted of the following for the periods specified (in thousands):
September 30, 2021December 31, 2020
Property, plant and equipment$181,556 $174,553 
Accumulated depreciation(107,179)(100,501)
Property, plant and equipment — net$74,377 $74,052