Fair Value Measurements (Details) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) outparcel	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 4,488,714		$ 4,488,714		$ 4,488,714		$ 4,488,714	$ 4,737,077
Mortgage and other indebtedness, net	4,249,440		4,249,440		4,249,440		4,249,440	$ 4,465,294
Fair Value	67,300		67,300		67,300		67,300
Loss on impairment			43,203	$ 43,493	$ 46,466	$ 63,178
Number of outparcels with impairment | outparcel					1
Outlet Mall and Outparcel Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment					$ 46,466
Outparcel Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment					$ 116
Number of properties disposed of | outparcel					1
Malls
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		$ 0
Loss on impairment		3,147
Investment in consolidated joint venture, fair value		$ 1,000
Malls | Acadiana Mall
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	67,300		67,300		$ 67,300		67,300
Loss on impairment	43,007
Investment in consolidated joint venture, fair value	67,300		67,300		$ 67,300		$ 67,300
Holding period (in years)					10 years
Capitalization rate (as a percent)					15.50%
Discount rate (as a percent)					15.75%
Percentage of total consolidated revenues							1.90%
Malls/Office Buildings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0		0		$ 0		$ 0
Loss on impairment	196
Malls, Office Buildings and Acadiana Mall
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	67,300		67,300		67,300		67,300
Loss on impairment					46,350
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0		0		0		0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0		0		0		0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 67,300		$ 67,300		$ 67,300		$ 67,300