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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment PROPERTY, PLANT, AND EQUIPMENT
Components of property, plant, and equipment at December 31 consisted of the following (in thousands):
20202019
Land and land improvements$4,605 $4,583 
Building and improvements41,164 39,901 
Machinery and equipment188,853 174,058 
Construction in progress10,458 5,131 
Property, plant, and equipment, gross245,080 223,673 
Less: accumulated depreciation(155,518)(145,521)
Property, plant, and equipment, net$89,562 $78,152