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Inventories - Components (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Inventory Disclosure [Abstract] |  |  |  |
Raw materials | $ 67,995 | $ 57,784 |  |
Work in process | 4,060 | 5,957 |  |
Finished goods | 6,767 | 8,163 |  |
Inventory, gross | 78,822 | 71,904 |  |
Less: Allowance for excess and obsolete inventories | (1,210) | (1,118) | $ (1,382) | $ (757)
Total, net | $ 77,612 | $ 70,786 |  |

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