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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant & Equipment |  |  |
Total | $ 183,500 | $ 174,553 |
Less accumulated depreciation | (107,603) | (100,501) |
Property, plant and equipment, net | 75,897 | 74,052 |
Purchase commitments for capital expenditures in progress | 5,315 | 677 |
Accounts payable | 22,695 | 16,994 |
Depreciation expense | 9,181 | 8,659 | $ 8,187
Accounts Payable, Current |  |  |
Property, Plant & Equipment |  |  |
Purchase commitments for capital expenditures in progress | 329 | 145 |
Land and land improvements |  |  |
Property, Plant & Equipment |  |  |
Total | 6,009 | 6,009 |
Buildings |  |  |
Property, Plant & Equipment |  |  |
Total | 43,901 | 43,545 |
Machinery and equipment |  |  |
Property, Plant & Equipment |  |  |
Total | 124,760 | 121,382 |
Tools, dies and patterns |  |  |
Property, Plant & Equipment |  |  |
Total | 2,225 | 2,195 |
Additions in progress |  |  |
Property, Plant & Equipment |  |  |
Total | $ 6,605 | $ 1,422 |

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