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Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Revenue Recognition        
Reimbursable expenses $ 7,447 $ 8,658 $ 16,319 $ 17,686