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Inventories, Net and Significant Suppliers - Changes in Reserve for Excess and Obsolete Inventory (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 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 | 643 | 632
Sell through | (315) | (354)
(Write-offs)/Foreign exchange effects | (388) | (274)
Balance at end of period | 4,228 | 4,209
Inventory written-off and scrapped during production | $ 113 | $ 27

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