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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2018
Inventory Disclosure [Abstract] |
Inventories |
| September 30, 2018 |  | December 31, 2017
| (in thousands)
Raw materials | $ | 65,694 |  |  | $ | 57,784 |
Work in process | 6,116 |  |  | 5,957 |
Finished goods | 8,486 |  |  | 8,163 |
| 80,296 |  |  | 71,904 |
Less: Allowance for excess and obsolete inventories | (1,114 | ) |  | (1,118 | )
Total, net | $ | 79,182 |  |  | $ | 70,786 |
Inventories (Allowance) | The related changes in the allowance for excess and obsolete inventories account are as follows:
| Three months ended |  | Nine months ended
| September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 1,407 |  |  | $ | 1,642 |  |  | $ | 1,118 |  |  | $ | 1,382 |
Provisions for excess and obsolete inventories | (263 | ) |  | (206 | ) |  | 55 |  |  | 54 |
Inventories written off | (30 | ) |  | (243 | ) |  | (59 | ) |  | (243 | )
Balance, end of period | $ | 1,114 |  |  | $ | 1,193 |  |  | $ | 1,114 |  |  | $ | 1,193 |

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