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Financing Arrangement - Narrative (Details) ft² in Thousands, $ in Thousands			12 Months Ended
	Jun. 27, 2019 USD ($)	Sep. 30, 2009 ft²	Dec. 31, 2020 USD ($) $ / ft²	Dec. 31, 2019 USD ($) $ / ft²	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)
Schedule of Joint Ventures [Line Items]
Financing arrangement obligation			$ 134,379	$ 273,900
Accumulated deficit			$ (2,339,619)	$ (1,944,012)
Terminal capitalization rate			5.50%	5.00%
Discount rate			7.00%	6.00%
Distributions in excess of loan proceeds	$ 27,945		$ 0	$ 27,945	$ 0
Chandler Fashion Center
Schedule of Joint Ventures [Line Items]
Mortgage loan	$ 256,000
Financing arrangement | Minimum
Schedule of Joint Ventures [Line Items]
Market rent per square foot | $ / ft²			35	35
Financing arrangement | Maximum
Schedule of Joint Ventures [Line Items]
Market rent per square foot | $ / ft²			105	105
Financing arrangement | ASU 2014-09 | Difference between revenue guidance in effect before and after topic 606 | Freehold Raceway Mall and Chandler Fashion Center | Joint venture
Schedule of Joint Ventures [Line Items]
Financing arrangement obligation						$ 393,709
Accumulated deficit						424,859
Financing arrangement | Freehold Raceway Mall and Chandler Fashion Center
Schedule of Joint Ventures [Line Items]
Ownership interest (as a percent)		49.90%
Financing arrangement | Chandler Fashion Center
Schedule of Joint Ventures [Line Items]
Property area (in square feet) | ft²		1,318
Financing arrangement | Freehold Raceway Mall
Schedule of Joint Ventures [Line Items]
Property area (in square feet) | ft²		1,552
Joint venture | Freehold Raceway Mall and Chandler Fashion Center
Schedule of Joint Ventures [Line Items]
Investments in unconsolidated joint ventures						$ 31,150

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Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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-Section 12
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