Inventories, Net and Significant Suppliers - Inventories, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 58,263		$ 43,638
Components	11,545		16,214
Work in process	5,908		1,847
Finished goods	79,007		105,178
Reserve for excess and obsolete inventory	(7,537)		(4,288)	$ (4,207)	$ (4,205)
Inventories, net	$ 147,186	$ 138,759	$ 162,589

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