Investments in Unconsolidated Entities - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING EXPENSES:
Income from Unconsolidated Entities	$ 69,085	$ 90,626
Equity Method Investees excluding Klepierre, Aeropostale and HBS | Unconsolidated properties
REVENUE:
Minimum rent	451,055	438,847
Overage rent	51,369	49,624
Tenant reimbursements	215,780	210,941
Other income	64,327	58,680
Total revenue	782,531	758,092
OPERATING EXPENSES:
Property operating	132,985	131,081
Depreciation and amortization	153,455	131,480
Real estate taxes	66,583	61,509
Repairs and maintenance	20,230	19,754
Advertising and promotion	22,198	22,529
Provision for credit losses	3,777	2,690
Other	43,355	45,053
Total operating expenses	442,583	414,096
Operating Income	339,948	343,996
Interest expense	(142,204)	(143,758)
Gain on sale or disposal of assets and interests in unconsolidated entities, net		54,473
Net Income	197,744	254,711
Third-Party Investors’ Share of Net Income	99,686	118,809
Our Share of Net Income	98,058	135,902
Amortization of Excess Investment	(22,457)	(23,213)
Our Share of Gain on Sale or Disposal of Assets and Interests Included in Other Income in the Consolidated Financial Statements		(36,153)
Income from Unconsolidated Entities	$ 75,601	$ 76,536