Recent Transactions (Summary Of Income From Property Held For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Less - accumulated depreciation	$ (1,382,962)	$ (1,464,482)
Rental property held for sale, net	200,044
Disposal Group, Disposed Of By Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land	46,883
Buildings and improvements	210,925
Less - accumulated depreciation	(57,764)
Rental property held for sale, net	$ 200,044