Inventories, Net and Significant Suppliers - Changes in Reserve for Excess and Obsolete Inventory (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Schedule of Reserve for Excess and Obsolete Inventory [Rollforward]
Balance at beginning of period	$ 5,138	$ 4,288
Additions charged to costs and expenses	7,430	5,353
Sell through	(1,220)	(1,240)
(Write-offs)/Foreign exchange effects	(1,838)	(1,118)
Balance at end of period	9,510	7,283
Inventory written-off and scrapped during production	$ 3,800	$ 1,100