Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Other Significant Noncash Transactions [Line Items]
Accrued dividends and distributions payable	$ 54,313	$ 54,490
Additions to real estate assets accrued but not yet paid	16,495	10,114
Capital contribution of note receivable to joint venture	5,280	0
Capital contribution from noncontrolling interest to joint venture	155	0
Write-off of notes receivable	1,846	0
Fashion Square
Other Significant Noncash Transactions [Line Items]
Assumption of mortgage loan from sale of property	38,237	0
Eastgate Crossing
Other Significant Noncash Transactions [Line Items]
Assumption of mortgage loan from sale of property	0	14,570
River Ridge Mall
Other Significant Noncash Transactions [Line Items]
Decrease in real estate assets	(14,025)	0
Increase in investment in unconsolidated affiliate	14,030	0
Decrease in accounts payable and accrued liabilities	$ (5)	$ 0