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Assets - Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, plant, and equipment      
Gross property, plant and equipment $ 218,467   $ 215,090
Less: accumulated depreciation and amortization 153,260   149,819
Net property, plant, and equipment 65,207   65,271
Depreciation expense 3,500 $ 3,900  
Land      
Property, plant, and equipment      
Gross property, plant and equipment 5,061   5,061
Building and improvements      
Property, plant, and equipment      
Gross property, plant and equipment 63,059   62,865
Machinery and equipment      
Property, plant, and equipment      
Gross property, plant and equipment 142,163   140,493
Leaseholds improvements      
Property, plant, and equipment      
Gross property, plant and equipment $ 8,184   $ 6,671