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Certain Balance Sheet Components Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Trade receivables (net of allowance of $1,107 and $1,312) $ 286,539 $ 318,269
Unbilled receivables 49,532 51,559
Total accounts receivable, net $ 336,071 $ 369,828