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Certain Balance Sheet Components Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts Receivable, Net, Current [Abstract]    
Trade receivables (net of allowance of $3,991 and $3,320) $ 351,255 $ 299,870
Unbilled receivables 24,894 51,636
Total accounts receivable, net $ 376,149 $ 351,506