Rental Properties (Summary Of Carrying Amounts Of Rental Properties) (Details) (USD $)	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Real Estate Properties [Line Items]
Carrying amounts of rental properties	$ 2,823,482,000		$ 2,513,794,000
Accumulated depreciation	(453,284,000)		(409,643,000)
Total	2,370,198,000		2,104,151,000
Depreciation expense on rental properties	46,000,000	36,800,000
Building and improvements [Member]
Real Estate Properties [Line Items]
Carrying amounts of rental properties	2,198,301,000		1,937,661,000
Furniture, fixtures & equipment [Member]
Real Estate Properties [Line Items]
Carrying amounts of rental properties	28,531,000		26,676,000
Land [Member]
Real Estate Properties [Line Items]
Carrying amounts of rental properties	$ 596,650,000		$ 549,457,000

Real Estate Investment Property Gross

No definition available.

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(3))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 7

+ Details

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- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

+ Details

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- Details

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