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Leases (Schedule Of Rental Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Minimum rentals $ 278,812 $ 255,955 $ 227,602
Contingent rentals 2,317 1,811 4,542
Sublease rental income $ (2,214) $ (2,074) $ (1,879)