Inventories, Net and Significant Suppliers - Changes in Reserve for Excess and Obsolete Inventory (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 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	5,353	1,960
Sell through	(1,240)	(950)
(Write-offs)/Foreign exchange effects	(1,118)	(2,090)
Balance at end of period	7,283	3,125
Inventory written-off and scrapped during production	$ 1,100	$ 200

Amount of valuation reserve for inventory.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant