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Rental Properties (Summary Of Carrying Amounts Of Rental Properties) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Real Estate Properties [Line Items]      
Carrying amounts of rental properties $ 3,450,828   $ 2,917,194
Accumulated depreciation (511,949)   (465,660)
Total 2,938,879   2,451,534
Depreciation expense on rental properties 62,000 $ 46,000  
Building and improvements [Member]      
Real Estate Properties [Line Items]      
Carrying amounts of rental properties 2,751,714   2,273,430
Furniture, fixtures & equipment [Member]      
Real Estate Properties [Line Items]      
Carrying amounts of rental properties 33,099   25,922
Land [Member]      
Real Estate Properties [Line Items]      
Carrying amounts of rental properties $ 666,015   $ 617,842