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Inventories (Tables) | 6 Months Ended
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Jun. 30, 2018
Inventory Disclosure [Abstract] |
Inventories |
| June 30, 2018 |  | December 31, 2017
| (in thousands)
Raw materials | $ | 62,272 |  |  | $ | 57,784 |
Work in process | 3,414 |  |  | 5,957 |
Finished goods | 6,188 |  |  | 8,163 |
| 71,874 |  |  | 71,904 |
Less: Allowance for excess and obsolete inventories | (1,407 | ) |  | (1,118 | )
Total, net | $ | 70,467 |  |  | $ | 70,786 |
Inventories (Allowance) | The related changes in the allowance for excess and obsolete inventories account are as follows:
| Three months ended |  | Six months ended
| June 30, 2018 |  | June 30, 2017 |  | June 30, 2018 |  | June 30, 2017
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 1,209 |  |  | $ | 1,442 |  |  | $ | 1,118 |  |  | $ | 1,382 |
Provisions for excess and obsolete inventories | 217 |  |  | 200 |  |  | 318 |  |  | 260 |
Inventories written off | (19 | ) |  | — |  |  | (29 | ) |  | — |
Balance, end of period | $ | 1,407 |  |  | $ | 1,642 |  |  | $ | 1,407 |  |  | $ | 1,642 |

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