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Financing Arrangement - Narrative (Details) ft² in Thousands, $ in Thousands		12 Months Ended
	Sep. 30, 2009 ft²	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Co-Venture Arrangement
Investments in unconsolidated joint ventures		$ 0		$ 31,150
Financing arrangement obligation		378,485		0
Accumulated deficit		$ (1,614,357)		$ (830,279)
Discount rate		5.80%
Freehold Raceway Mall and Chandler Fashion Center | Joint venture
Co-Venture Arrangement
Investments in unconsolidated joint ventures			$ 31,150
Financing arrangement
Co-Venture Arrangement
Net operating income multiple		21
Financing arrangement | Joint venture
Co-Venture Arrangement
Distributions of partner's share of net income		$ (9,079)
Distributions in excess of partner's share of net income		(6,376)
Adjustment to fair value of financing arrangement obligation		$ (15,225)
Financing arrangement | Minimum
Co-Venture Arrangement
Market rent per square foot		20
Financing arrangement | Maximum
Co-Venture Arrangement
Market rent per square foot		225
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
Co-Venture Arrangement
Financing arrangement obligation			393,709
Accumulated deficit			$ 424,859
Financing arrangement | Freehold Raceway Mall and Chandler Fashion Center
Co-Venture Arrangement
Ownership interest (as a percent)	49.90%
Financing arrangement | Freehold Raceway Mall
Co-Venture Arrangement
Property area (in square feet) | ft²	1,672
Financing arrangement | Chandler Fashion Center
Co-Venture Arrangement
Property area (in square feet) | ft²	1,318

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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