Rental Properties (Summary Of Carrying Amounts Of Rental Properties) (Details) (USD $)
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9 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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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]
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Real Estate Properties [Line Items] | |||
Carrying amounts of rental properties | 1,817,815,000 | 1,734,300,000 | |
Furniture, fixtures & equipment [Member]
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Real Estate Properties [Line Items] | |||
Carrying amounts of rental properties | 18,271,000 | 34,028,000 | |
Land [Member]
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Real Estate Properties [Line Items] | |||
Carrying amounts of rental properties | $ 495,733,000 | $ 492,449,000 |