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Inventories, Net and Significant Suppliers - Changes in Reserve for Excess and Obsolete Inventory (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Schedule of Reserve for Excess and Obsolete Inventory [Rollforward] |  |
Balance at beginning of period | $ 4,288 | $ 4,205
Additions charged to costs and expenses | 4,564 | 1,218
Sell through | (680) | (576)
(Write-offs)/Foreign exchange effects | (635) | (640)
Balance at end of period | 7,537 | 4,207
Inventory written-off and scrapped during production | $ 500 | $ 200

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