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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant & Equipment |  |  |
Total | $ 209,333 | $ 200,525 |
Less accumulated depreciation | (128,148) | (117,258) |
Property, plant and equipment, net | 81,185 | 83,267 |
Purchase commitments for capital expenditures in progress | 1,100 | 2,812 |
Accounts payable | 23,958 | 29,586 |
Depreciation expense | 11,229 | 9,655 | $ 9,181
Accounts Payable, Current |  |  |
Property, Plant & Equipment |  |  |
Purchase commitments for capital expenditures in progress | 298 | 868 |
Land and land improvements |  |  |
Property, Plant & Equipment |  |  |
Total | 6,009 | 6,009 |
Building and improvements |  |  |
Property, Plant & Equipment |  |  |
Total | 45,775 | 44,490 |
Machinery and equipment |  |  |
Property, Plant & Equipment |  |  |
Total | 152,063 | 139,408 |
Tools, dies and patterns |  |  |
Property, Plant & Equipment |  |  |
Total | 3,222 | 3,222 |
Additions in progress |  |  |
Property, Plant & Equipment |  |  |
Total | $ 2,264 | $ 7,396 |

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