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Investment in Unconsolidated Ventures (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Financial position of the Real Estate Ventures
Company's share of equity (Company's basis)	$ 82,927	$ 84,372
Unconsolidated real estate ventures [Member]
Financial position of the Real Estate Ventures
Net property	726,254	804,705
Other Assets	99,589	105,576
Other Liabilities	39,583	44,509
Debt	683,679	748,387
Equity	102,581	117,385
Company's share of equity (Company's basis)	$ 82,927	$ 84,372

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph f

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