Inventories, Net and Significant Suppliers - Inventories, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 59,412	$ 68,834
Components	21,557	25,071
Work in process	5,757	5,577
Finished goods	60,306	50,006
Reserve for excess and obsolete inventory	(9,510)	(5,138)	$ (7,283)	$ (4,288)
Inventories, net	$ 137,522	$ 144,350

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