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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
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,
| 2018 |  | 2017
| (in thousands)
Raw materials | $ | 67,995 |  |  | $ | 57,784 |
Work in process | 4,060 |  |  | 5,957 |
Finished goods | 6,767 |  |  | 8,163 |
| 78,822 |  |  | 71,904 |
Less: Allowance for excess and obsolete inventories | (1,210 | ) |  | (1,118 | )
Total, net | $ | 77,612 |  |  | $ | 70,786 |
Inventories (Allowance) |
| Years Ending December 31,
| 2018 |  | 2017 |  | 2016
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 1,118 |  |  | $ | 1,382 |  |  | $ | 757 |
Provisions for excess and obsolete inventories | 152 |  |  | 102 |  |  | 625 |
Inventories written off | (60 | ) |  | (366 | ) |  | — |
Balance, end of period | $ | 1,210 |  |  | $ | 1,118 |  |  | $ | 1,382 |

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