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Rental Properties (Summary Of Carrying Amounts Of Rental Properties) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Dec. 31, 2014
Real Estate Properties [Line Items]        
Carrying amounts of rental properties $ 3,029,141     $ 2,917,194
Accumulated depreciation (492,602)   $ (492,602) (465,660)
Total 2,536,539     2,451,534
Depreciation expense on rental properties 39,400 $ 29,700    
Building and improvements [Member]        
Real Estate Properties [Line Items]        
Carrying amounts of rental properties 2,369,355     2,273,430
Furniture, fixtures & equipment [Member]        
Real Estate Properties [Line Items]        
Carrying amounts of rental properties 29,751     25,922
Land [Member]        
Real Estate Properties [Line Items]        
Carrying amounts of rental properties $ 630,035     $ 617,842