Investments in Unconsolidated Entities and International Investments - Combined Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING EXPENSES:
Income from Unconsolidated Entities	$ 50,465	$ 90,444
Equity Method Investees excluding Klepierre, Aeropostale, ABG, HBS, RGG and Forever 21 | Unconsolidated properties
REVENUE:
Lease income	743,849	758,979
Other income	74,515	75,922
Total revenue	818,364	834,901
OPERATING EXPENSES:
Property operating	147,030	144,721
Depreciation and amortization	171,479	170,258
Real estate taxes	68,390	68,717
Repairs and maintenance	19,615	22,376
Advertising and promotion	22,753	24,326
Other	50,229	49,316
Total operating expenses	479,496	479,714
Operating Income Before Other Items	338,868	355,187
Interest expense	(156,640)	(156,016)
Gain on sale or disposal of assets and interests in unconsolidated entities, net		21,587
Net Income	182,228	220,758
Third-Party Investors' Share of Net Income	92,859	112,668
Our Share of Net Income	89,369	108,090
Amortization of Excess Investment	(20,840)	(20,792)
Our Share of Gain on Sale or Disposal of Assets and Interest in Other Income in the Consolidated Financial Statements		(9,155)
Income from Unconsolidated Entities	$ 68,529	$ 78,143