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Fair Value of Financial Instruments (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Properties
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted Average Fair Value Interest Rate on Debt	3.214%
Fair Value of Financial Instruments (Textuals) [Abstract]
Gross deferred gain on sale of properties	$ 12.9
Number of properties sold (in properties)	2

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Number of properties sold.

+ References

No definition available.

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Weighted Average Fair Value Interest Rate on Debt Unobservable Input Fair Value Intererest Rates

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- 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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