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Certain Balance Sheet Components Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Materials $ 111,832 $ 103,274
Work in process 10,573 7,925
Finished goods 55,655 51,850
Total inventories $ 178,060 $ 163,049