Investments in Real Estate Partnerships - Balance Sheet Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Document Fiscal Year Focus	2016
Investment in real estate, net	$ 2,439,110	$ 2,497,770
Acquired lease intangible assets, net	42,974	43,469
Other assets	126,658	134,146
Total assets	2,608,742	2,675,385
Notes payable	1,309,931	1,401,977
Acquired lease intangible liabilities, net	29,678	23,826
Other liabilities	64,979	66,061
Capital - Regency	405,722	414,681
Capital - Third parties	798,432	768,840
Total liabilities and capital	2,608,742	2,675,385
Impairment Losses Related to Real Estate Partnerships	(1,300)	(1,300)
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	(29,520)	(28,972)
Equity Method Summarized Financial Information, Net Book Equity in Excess of Purchase Price	(78,203)	(78,203)
Investments in real estate partnerships (note 4)	$ 296,699	$ 306,206