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Revenue Recognition - Unbilled Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Dec. 31, 2016
Roll forward of the unbilled receivables allowance          
Balance at beginning of period     $ 1,720 $ 2,354 $ 2,354
Increases to reserves     1,299   2,102
Amounts written off     (324)   (2,736)
Balance at end of period $ 2,695   2,695   1,720
Bad debt expense     1,968   2,156
Reimbursable expenses $ 10,648 $ 8,511 $ 19,788 $ 16,541  
Selling, general and administrative expenses          
Roll forward of the unbilled receivables allowance          
Bad debt expense         $ 1,100