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Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Land and land improvements $ 6,108 $ 6,061
Building and improvements 49,804 46,678
Machinery and equipment 213,550 204,326
Construction in progress 5,977 7,690
Property, plant, and equipment, gross 275,439 264,755
Less: accumulated depreciation (180,030) (168,925)
Property, plant, and equipment, net $ 95,409 $ 95,830