Rental Properties (Summary Of Carrying Amounts Of Rental Properties) (Details) - USD ($) $ in Thousands |
9 Months Ended | ||
---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
|
Real Estate Properties [Line Items] | |||
Carrying amounts of rental properties | $ 5,740,235 | $ 5,345,565 | |
Accumulated depreciation | (848,280) | (741,334) | |
Total | 4,891,955 | 4,604,231 | |
Depreciation expense on rental properties | 110,400 | $ 93,200 | |
Building and improvements [Member] | |||
Real Estate Properties [Line Items] | |||
Carrying amounts of rental properties | 4,455,367 | 4,123,356 | |
Furniture, fixtures & equipment [Member] | |||
Real Estate Properties [Line Items] | |||
Carrying amounts of rental properties | 89,857 | 87,630 | |
Land [Member] | |||
Real Estate Properties [Line Items] | |||
Carrying amounts of rental properties | 1,169,237 | 1,108,805 | |
Leaseholds and Leasehold Improvements [Member] | |||
Real Estate Properties [Line Items] | |||
Carrying amounts of rental properties | $ 25,774 | $ 25,774 |