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Revenues (Schedule Of Annual Future Base Rents Due To Be Received Under Non-Cancelable Operating Leases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues [Abstract]
2013	$ 103,253,000
2014	94,053,000
2015	82,900,000
2016	71,206,000
2017	59,621,000
Thereafter	304,714,000
Future rents due to be received	715,747,000
Expense recoveries	$ 27,400,000	$ 27,900,000	$ 26,000,000

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