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Real Estate (Real Estate Available and Held for Sale) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real Estate Properties [Line Items]
Real estate available and held for sale		$ 360,517,000	$ 635,865,000
Income from sales of residential property	27,900,000	86,658,000	63,472,000	5,721,000
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale		221,000,000	374,100,000
Land
Real Estate Properties [Line Items]
Real estate available and held for sale		132,189,000	181,278,000
Number of properties transferred from held-for-sale to held-for-use		2
Property transferred from held for sale		49,700,000
Number of real estate properties transferred to held for sale		3
Property transferred to held for sale		31,800,000
Number of real estate properties sold		3
Income from sales of residential property		600,000
Net Lease
Real Estate Properties [Line Items]
Real estate available and held for sale		0	0
Property transferred to held for sale		9,800,000
Number of real estate properties sold		5
Gain (Loss) on Disposition of Real Estate, Discontinued Operations		3,600,000
Commercial Operating Properties
Real Estate Properties [Line Items]
Number of properties transferred from held-for-sale to held-for-use			2
Property transferred from held for sale			49,800,000
Number of real estate properties sold		6
Depreciation expense on reclassified assets			3,300,000
Other Income | Commercial Operating Properties
Real Estate Properties [Line Items]
Reclassification of results of operations			21,148,000	21,663,000
Real Estate Expenses | Commercial Operating Properties
Real Estate Properties [Line Items]
Reclassification of results of operations			$ (22,603,000)	$ (24,297,000)

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- Definition

Number of Properties Transferred from Held for Sale to Held for Use

+ References

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- Definition

Number of Real Estate Properties Sold

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- Definition

Number of Real Estate Properties Transferred to Held for Sale

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- Definition

Property Transferred from HFS, Aggregate, Carrying Value

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- Definition

Property Transferred to Held for Sale, Aggregate, Carrying Value

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- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity.

+ References

No definition available.

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- Definition

Reclassification of Results of Operations

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- Definition

The gain resulting from the sale or other disposition of residential properties or components of those assets during the period.

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- Definition

For the asset that is reclassified back to held and use from held-for-sale, the depreciation expense recognized when the asset is reclassified. This represents the difference between the carrying value at the time the decision to reclassify is made and the carrying amount that the asset would have had if it had never been classified as held for sale (including consideration of depreciation expense).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2459-110228



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 35

-Paragraph 44

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1756-110224

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Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations.

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