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Properties Held For Sale and Related Transactions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Apr. 30, 2011	Mar. 31, 2013 property	Dec. 31, 2012
Properties Held For Sale And Related Transactions [Abstract]
Mortgage loans payable and accrued interest for properties under conveyance process		$ 24.0
Number of properties in process of conveying		4
Deferred gain on conveyance		11.7
Loan to developers	4.1
Interest rate on loan to developers	6.25%
Impairment charge of mortgage loan receivable			4.4
Collection on developers loan		1.1
Impairment reversal		$ (1.1)

X

- Definition

Impairment Charge Related To Mortgage Loan On Real Estate

+ References

No definition available.

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X

- Definition

Mortgage Loans Payable And Accrued Interest For Conveyance Properties In Process

+ References

No definition available.

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X

- Definition

Number Of Properties In Process Of Conveying

+ References

No definition available.

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X

- Definition

Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 40

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.U.Q2)

-URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791

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X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 26

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The amount of principal collected on mortgage loans on real estate during the reporting period.

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- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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