Dispositions (Details) $ in Thousands	1 Months Ended				3 Months Ended					6 Months Ended
	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($)	Apr. 30, 2017 USD ($) loan	Jan. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2017 USD ($) outparcel	Jun. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price, Gross										$ 189,750
Sales Price, Net										112,076
Gain										77,428
Loss on impairment					$ 43,203		$ 43,493			46,466	$ 63,178
Gain on sales of real estate assets										85,521	9,577
Gain on extinguishment of debt					$ 20,420		$ 0			24,475	$ 6
One and Two Oyster Point
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price, Gross				$ 6,250
Sales Price, Net				6,142
Gain				0
Loss on impairment						$ 3,844
Outlet Shoppes at Oklahoma City
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price, Gross			$ 130,000
Sales Price, Net			55,368
Gain			$ 75,434
Number of loans retired | loan			3
Priority received			$ 7,477
College Square Mall and Foothills Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price, Gross		$ 53,500
Sales Price, Net		50,566
Gain		$ 1,994
Midland Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment								$ 4,681
Balance of Non-recourse Debt				31,953
Gain on extinguishment of debt				$ 3,760
Non-cash default interest expense								$ 479
Chesterfield Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment									$ 99,969
Balance of Non-recourse Debt	$ 140,000
Gain on extinguishment of debt	$ 29,215
Non-cash default interest expense									$ 4,324
Midland Mall and Chesterfield Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Balance of Non-recourse Debt										171,953
Gain on extinguishment of debt										32,975
Outparcel Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sales of real estate assets										$ 8,093
Number of properties disposed of | outparcel										6
Parent Company | Outlet Shoppes at Oklahoma City
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain			$ 48,800
Percentage of equity interest in real estate property			7500.00%
Corporate Joint Venture | Outlet Shoppes at Oklahoma City
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interest in real estate property			2500.00%