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Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |
Raw material | $ 42,528 | $ 41,758
Work-in-process | 12,580 | 12,268
Finished goods | 30,957 | 35,586
Total inventories | $ 86,065 | $ 89,612

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