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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment Property, Plant, and Equipment
Property, plant, and equipment consisted of the following at December 31 (in thousands):
20212020
Land and land improvements$6,009 $6,009 
Buildings43,901 43,545 
Machinery and equipment124,760 121,382 
Tools, dies, and patterns2,225 2,195 
Additions in progress6,605 1,422 
Total183,500 174,553 
Less accumulated depreciation(107,603)(100,501)
Property, plant and equipment, net$75,897 $74,052 
Additions in progress at December 31, 2021 and 2020 relate to building improvements and equipment purchases that were not yet completed and placed in service at year end. At December 31, 2021, commitments for capital expenditures in progress were $5,315,000 and included $329,000 recorded on the balance sheet in accounts payable. At December 31, 2020, commitments for capital expenditures in progress were $677,000, and included $145,000 recorded on the balance sheet in accounts payable. Depreciation expense was $9,181,000, $8,659,000 and $8,187,000 for the years ended December 31, 2021, 2020 and 2019, respectively.