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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2021
Inventory Disclosure [Abstract] |
Inventories | The components of inventories and related changes in the allowance for excess and obsolete inventories account are as follows:
| September 30, 2021 |  | December 31, 2020
| (in thousands)
Raw materials | $ | 97,167 |  |  | $ | 76,238 |
Work in process | 4,749 |  |  | 2,088 |
Finished goods | 4,929 |  |  | 7,154 |
Total, gross | 106,845 |  |  | 85,480 |
Less: Allowance for excess and obsolete inventories | (2,292) |  |  | (3,261) |
Total, net | $ | 104,553 |  |  | $ | 82,219 |
Inventories (Allowance) |
| Three Months Ended |  | Nine Months Ended
| September 30, 2021 |  | September 30, 2020 |  | September 30, 2021 |  | September 30, 2020
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 2,726 |  |  | $ | 2,373 |  |  | $ | 3,261 |  |  | $ | 2,644 |
Provisions for excess and obsolete | 86 |  |  | 1,969 |  |  | 378 |  |  | 1,776 |
inventories |  |  |  |  |  |  |
Inventories written off | (520) |  |  | (230) |  |  | (1,347) |  |  | (308) |
Balance, end of period | $ | 2,292 |  |  | $ | 4,112 |  |  | $ | 2,292 |  |  | $ | 4,112 |

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