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Inventories (Components) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
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Inventory Disclosure [Abstract] |  |  |  |  |  |
Raw materials | $ 55,930 |  | $ 43,438 |  |  |
Work in process | 2,867 |  | 2,279 |  |  |
Finished goods | 5,920 |  | 3,017 |  |  |
Inventory, gross | 64,717 |  | 48,734 |  |  |
Less: Allowance for excess and obsolete inventories | (1,642) | $ (1,442) | (1,382) | $ (1,065) | $ (894) | $ (757)
Total, net | $ 63,075 |  | $ 47,352 |  |  |

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