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Inventories (Tables) | 6 Months Ended
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Jun. 30, 2017
Inventory Disclosure [Abstract] |
Inventories |
| June 30, 2017 |  | December 31, 2016
| (in thousands)
Raw materials | $ | 55,930 |  |  | $ | 43,438 |
Work in process | 2,867 |  |  | 2,279 |
Finished goods | 5,920 |  |  | 3,017 |
| 64,717 |  |  | 48,734 |
Less: Allowance for excess and obsolete inventories | (1,642 | ) |  | (1,382 | )
Total, net | $ | 63,075 |  |  | $ | 47,352 |
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, 2017 |  | June 30, 2016 |  | June 30, 2017 |  | June 30, 2016
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 1,442 |  |  | $ | 894 |  |  | $ | 1,382 |  |  | $ | 757 |
Provisions for excess and obsolete inventories | 200 |  |  | 171 |  |  | 260 |  |  | 308 |
Inventories written off | — |  |  | — |  |  | — |  |  | — |
Balance, end of period | $ | 1,642 |  |  | $ | 1,065 |  |  | $ | 1,642 |  |  | $ | 1,065 |

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