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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2022
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):
20222021
Land and land improvements$6,009 $6,009 
Building and improvements44,490 43,901 
Machinery and equipment139,408 124,760 
Tools, dies, and patterns3,222 2,225 
Additions in progress7,396 6,605 
Total200,525 183,500 
Less accumulated depreciation(117,258)(107,603)
Property, plant and equipment, net$83,267 $75,897 
Additions in progress at December 31, 2022 and 2021 relate to building improvements and equipment purchases that were not yet completed and placed in service at year end. At December 31, 2022, commitments for capital expenditures in progress were $2,812,000 and included $868,000 recorded on the balance sheet in accounts payable. 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. Depreciation expense was $9,655,000, $9,181,000 and $8,659,000 for the years ended December 31, 2022, 2021 and 2020, respectively.