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Inventories, Net and Significant Suppliers - Inventory Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Reserve for Excess and Obsolete Inventory |  |  |
Balance at beginning of period | $ 4,205 | $ 3,045 | $ 2,539
Additions charged to costs and expenses | 3,685 | 3,464 | 3,070
Sell through | (1,242) | (1,116) | (1,108)
(Write-offs)/Foreign exchange effects | (2,360) | (1,188) | (1,456)
Balance at end of period | 4,288 | 4,205 | 3,045
Inventory scrapped during production | $ 400 | $ 300 | $ 300

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