Identified Intangible Assets And Liabilities (Schedule Of Future Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Rental Revenues [Member] | Above-Market and Below-Market Leases [Member]
Finite-Lived Intangible Assets and Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	$ 4,691
2022	4,357
2023	4,172
2024	4,032
2025	3,234
Net amortization	7,800	$ 4,600	$ 12,800
Depreciation and Amortization [Member] | Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	19,580
2022	17,103
2023	15,549
2024	13,491
2025	12,204
Amortization	19,400	14,900	29,800
Interest Expense [Member] | Above-Market Assumed Mortgages [Member]
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	789
2022	643
2023	638
2024	638
2025	638
Amortization	$ 400	$ 300	$ 700