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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2018
Jan. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Liability—Co-venture obligation $ 0 $ 58,973      
Accumulated deficit (830,279) (488,782)      
Cumulative effect of adoption of ASU 2016-09 6,484        
Debt extinguishment costs 0 12,028 $ 14,579    
ASU 2014-09 | Difference between revenue guidance in effect before and after topic 606 | Freehold Raceway Mall and Chandler Fashion Center | Joint venture          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Accumulated deficit 424,850        
Pro forma | ASU 2014-09 | Difference between revenue guidance in effect before and after topic 606 | Freehold Raceway Mall and Chandler Fashion Center | Joint venture          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Liability—Co-venture obligation       $ 393,700  
Accumulated Deficit          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Cumulative effect of adoption of ASU 2016-09 6,484        
Accumulated Deficit | ASU 2016-09          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Cumulative effect of adoption of ASU 2016-09         $ 6,484
Freehold Raceway Mall and Chandler Fashion Center | Joint venture          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Investments in unconsolidated joint ventures $ 31,150 0      
Liability—Co-venture obligation   $ 58,973