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Leases (Schedule Of Rental Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Minimum rentals $ 294,854 $ 278,812 $ 255,955
Contingent rentals 2,714 2,317 1,811
Sublease rental income $ (297,568) $ (281,129) $ (257,766)