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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Property, Plant & Equipment |  |  |
Total | $ 200,525 | $ 183,500 |
Less accumulated depreciation | (117,258) | (107,603) |
Property, plant and equipment, net | 83,267 | 75,897 |
Purchase commitments for capital expenditures in progress | (2,812) | (5,315) |
Accounts payable | 29,586 | 22,695 |
Depreciation expense | 9,655 | 9,181 | $ 8,659
Accounts Payable, Current |  |  |
Property, Plant & Equipment |  |  |
Purchase commitments for capital expenditures in progress | (868) | (329) |
Land and land improvements |  |  |
Property, Plant & Equipment |  |  |
Total | 6,009 | 6,009 |
Building and improvements |  |  |
Property, Plant & Equipment |  |  |
Total | 44,490 | 43,901 |
Machinery and equipment |  |  |
Property, Plant & Equipment |  |  |
Total | 139,408 | 124,760 |
Tools, dies and patterns |  |  |
Property, Plant & Equipment |  |  |
Total | 3,222 | 2,225 |
Additions in progress |  |  |
Property, Plant & Equipment |  |  |
Total | $ 7,396 | $ 6,605 |

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