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Components of Rental Income and Expense (Schedule Of Minimum Rent) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components Of Rental Income and Expense [Abstract]      
Straight-line rents $ 12,900 $ 8,100 $ 7,600
Net amortization of above and below market leases $ 4,721 $ 1,825 $ 2,705