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Certain Balance Sheet Components Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Trade receivables (net of allowance of $3,046 and $3,064) $ 398,025 $ 415,887
Unbilled receivables 65,588 57,038
Total accounts receivable, net $ 463,613 $ 472,925