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Acquisitions (Schedule Of Pro Forma Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Parent Company [Member]        
Sales $ 854,261 $ 867,149 $ 2,583,059 $ 2,616,117