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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Inventories | The components of inventories and the related changes in the allowance for excess and obsolete inventories are as follows:
| December 31,
| 2020 |  | 2019
| (in thousands)
Raw materials | $ | 76,238 |  |  | $ | 68,842 |
Work in process | 2,088 |  |  | 1,825 |
Finished goods | 7,154 |  |  | 5,578 |
| 85,480 |  |  | 76,245 |
Less: Allowance for excess and obsolete inventories | (3,261) |  |  | (2,644) |
Total, net | $ | 82,219 |  |  | $ | 73,601 |
Inventories (Allowance) |
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 2,644 |  |  | $ | 1,210 |  |  | $ | 1,118 |
Provisions for excess and obsolete inventories | 1,108 |  |  | 1,454 |  |  | 152 |
Inventories written off | (491) |  |  | (20) |  |  | (60) |
Balance, end of period | $ | 3,261 |  |  | $ | 2,644 |  |  | $ | 1,210 |

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