Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Summary Of Income From Property Held For Sale, Net) (Details)

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Recent Transactions (Summary Of Income From Property Held For Sale, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less - accumulated depreciation $ (1,332,073) $ (1,464,482)
Rental property held for sale, net 39,743  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Land 10,934  
Buildings and improvements 68,266  
Less - accumulated depreciation (31,792)  
Less: Unrealized losses on properties held for sale (7,665)  
Rental property held for sale, net $ 39,743