Investments in Real Estate Partnerships - Balance Sheet Summarized Financial Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Investment in real estate, net	$ 3,213,984	$ 3,263,704
Acquired lease intangible assets, net	74,986	85,232
Other assets	145,984	152,839
Total assets	3,434,954	3,501,775
Notes payable	1,816,648	1,874,780
Acquired lease intangible liabilities, net	46,264	49,938
Other liabilities	70,576	67,495
Capital - Regency	518,505	512,421
Capital - Third parties	982,961	997,141
Total liabilities and capital	$ 3,434,954	$ 3,501,775