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Revenue Recognition (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Revenue Recognition        
Reimbursable expenses $ 9,521 $ 7,956 $ 26,929 $ 25,070