Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Other Significant Noncash Transactions [Line Items]
Accrued dividends and distributions payable	$ 54,376	$ 54,565
Additions to real estate assets accrued but not yet paid	15,842	12,571
Note receivable from sale of outparcel	1,802	0
Decrease in noncontrolling interest and joint venture interest	2,232
Corporate Joint Venture
Other Significant Noncash Transactions [Line Items]
Decrease in real estate assets	(9,131)	0
Decrease in mortgage and other indebtedness	2,466	0
Decrease in operating assets and liabilities	1,286	0
Decrease in noncontrolling interest and joint venture interest	2,232	0
Outlet Shoppes at Atlanta - Ridgewalk
Other Significant Noncash Transactions [Line Items]
Decrease in real estate assets	(139,623)	0
Decrease in mortgage and other indebtedness	171,953	0
Decrease in operating assets and liabilities	$ 645	$ 0