Investments in Real Estate Partnerships - Balance Sheet Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Document Fiscal Year Focus	2015
Investment in real estate, net	$ 2,497,770	$ 2,620,583
Acquired lease intangible assets, net	43,469	50,763
Other assets	134,146	136,156
Total assets	2,675,385	2,807,502
Notes payable	1,401,977	1,462,790
Acquired lease intangible liabilities, net	23,826	28,991
Other liabilities	66,061	67,093
Capital - Regency	414,681	442,050
Capital - Third parties	768,840	806,578
Total liabilities and capital	2,675,385	2,807,502
Impairment Losses Related to Real Estate Partnerships	(1,300)	(1,300)
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	(28,972)	(29,380)
Equity Method Summarized Financial Information, Net Book Equity in Excess of Purchase Price	(78,203)	(78,203)
Investments in real estate partnerships (note 4)	$ 306,206	$ 333,167