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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2023
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):
20232022
Land and land improvements$6,009 $6,009 
Building and improvements45,775 44,490 
Machinery and equipment152,063 139,408 
Tools, dies, and patterns3,222 3,222 
Additions in progress2,264 7,396 
Total209,333 200,525 
Less accumulated depreciation(128,148)(117,258)
Property, plant and equipment, net$81,185 $83,267 
Additions in progress at December 31, 2023 and 2022 relate to building improvements and equipment purchases that were not yet completed and placed in service at year end. At December 31, 2023, commitments for capital expenditures in progress were $1,100,000 and included $298,000 recorded on the balance sheet in accounts payable. 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. Depreciation expense was $11,229,000, $9,655,000 and $9,181,000 for the years ended December 31, 2023, 2022 and 2021, respectively.