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Rental Properties (Summary Of Carrying Amounts Of Rental Properties) (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Real Estate Properties [Line Items]      
Carrying amounts of rental properties $ 2,331,819,000   $ 2,260,777,000
Accumulated depreciation (398,037,000)   (375,684,000)
Total 1,933,782,000   1,885,093,000
Depreciation expense on rental properties 36,800,000 32,300,000  
Building and improvements [Member]
     
Real Estate Properties [Line Items]      
Carrying amounts of rental properties 1,817,815,000   1,734,300,000
Furniture, fixtures & equipment [Member]
     
Real Estate Properties [Line Items]      
Carrying amounts of rental properties 18,271,000   34,028,000
Land [Member]
     
Real Estate Properties [Line Items]      
Carrying amounts of rental properties $ 495,733,000   $ 492,449,000