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Accounts Receivable And Unbilled Revenue, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 30, 2016
Accounts Receivable And Unbilled Revenue Net [Abstract]    
Accounts receivable $ 37,481 $ 39,335
Unbilled revenue 15,789 10,638
Allowance for doubtful accounts (2,909) (2,574)
Accounts receivable and unbilled revenue, net $ 50,361 $ 47,399