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Rental Properties (Summary Of Carrying Amounts Of Rental Properties) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Real Estate Properties [Line Items]      
Carrying amounts of rental properties $ 5,663,792   $ 5,345,565
Accumulated depreciation (810,604)   (741,334)
Total 4,853,188   4,604,231
Depreciation expense on rental properties 72,900 $ 59,300  
Building and improvements [Member]      
Real Estate Properties [Line Items]      
Carrying amounts of rental properties 4,390,112   4,123,356
Furniture, fixtures & equipment [Member]      
Real Estate Properties [Line Items]      
Carrying amounts of rental properties 89,559   87,630
Land [Member]      
Real Estate Properties [Line Items]      
Carrying amounts of rental properties 1,158,347   1,108,805
Leaseholds and Leasehold Improvements [Member]      
Real Estate Properties [Line Items]      
Carrying amounts of rental properties $ 25,774   $ 25,774