Certain Balance Sheet Components Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment, Net [Abstract]
Machinery and equipment	$ 332,055	$ 310,753
Computers and software	111,227	104,384
Buildings, furniture, and improvements	150,049	135,566
Land	16,638	18,433
Construction in progress, including purchased equipment	41,959	39,946
Total cost	651,928	609,082
Accumulated depreciation	(417,004)	(408,314)
Property, plant, and equipment, net	$ 234,924	$ 200,768