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Fair Value Measurements - Impairment of Real Estate Properties (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
yr
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
yr
mall
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
yr
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on impairment $ 51,983 $ 43,203 $ 70,044 $ 46,466 $ 67,532
Number of malls with impairment | mall     2    
Fair Value 51,640   $ 51,640   81,350
Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on impairment     70,044    
Fair Value 51,640   51,640    
Outlet Mall and Outparcel Sale          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on impairment     70,044    
Janesville Mall          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Net sales price 17,640   17,640    
Janesville Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on impairment     18,061    
Fair Value 17,640   17,640    
Cary Towne Center | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on impairment     51,983    
Fair Value $ 34,000   $ 34,000    
Acadiana Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on impairment         43,007
Fair Value         67,300
Fair value of equity method investments         67,300
Hickory Point Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on impairment         24,525
Fair Value         $ 14,050
Expected Term | Cary Towne Center | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input | yr 10   10    
Expected Term | Acadiana Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input | yr         10
Expected Term | Hickory Point Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input | yr         10
Cap Rate | Cary Towne Center | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input 0.120   0.120    
Cap Rate | Acadiana Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input         0.155
Cap Rate | Hickory Point Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input         0.180
Discount Rate | Cary Towne Center | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input 0.13   0.13    
Discount Rate | Acadiana Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input         0.1575
Discount Rate | Hickory Point Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input         0.190