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Commitments and Contingencies (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2011 Property	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2011 Maximum [Member]
Additional Commitments and Contingencies (Textual) [Abstract]
Expiry date of letter of credit				Febuary 2012	July 2013
Commitments and Contingencies (Textual) [Abstract]
Number leased properties having the options to purchase the property	12
Letters of credit outstanding in aggregate amount	$ 6,780
Operating and ground lease expense	$ 1,955	$ 3,047	$ 4,181

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- Definition

Reflects when the letter of credits terminate, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

No definition available.

+ Details

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- Definition

The number of operating leases which contain options to purchase the property.

+ References

No definition available.

+ Details

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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