Investments in Real Estate Partnerships - Balance Sheet Summarized Financial Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Investment in real estate, net	$ 3,263,704	$ 3,686,565
Acquired lease intangible assets, net	85,232	120,163
Other assets	152,839	176,394
Total assets	3,501,775	3,983,122
Notes payable	1,874,780	2,117,695
Acquired lease intangible liabilities, net	49,938	75,551
Other liabilities	67,495	69,230
Capital - Regency	512,421	557,374
Capital - Third parties	997,141	1,163,272
Total liabilities and capital	$ 3,501,775	$ 3,983,122