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Assets - Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Property, plant, and equipment      
Gross property, plant and equipment $ 268,760   $ 260,642
Less: accumulated depreciation and amortization 164,632   160,899
Net property, plant, and equipment 104,128   99,743
Depreciation expense 3,700 $ 3,500  
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 63,973   63,946
Machinery and equipment      
Property, plant, and equipment      
Gross property, plant and equipment 149,192   145,656
Leaseholds improvements      
Property, plant, and equipment      
Gross property, plant and equipment $ 50,534   $ 45,979