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Fair Value Measurements - Impairment of Real Estate Properties (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on Impairment   $ 41,608 $ 51,983 $ 66,433 $ 70,044
Fair Value   127,319 34,000 127,319 34,000
Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on Impairment         70,044
Fair Value     34,000   34,000
Greenbrier Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on Impairment       22,770  
Fair Value   56,300   56,300  
Honey Creek Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on Impairment $ (239)     2,045  
Fair Value   14,360   14,360  
The Forum at Grandview | All Other          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on Impairment       8,582  
Fair Value   31,559   31,559  
EastGate Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on Impairment       33,265  
Fair Value   25,100   25,100  
Prior period adjustments | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on Impairment       (229)  
Fair Value   $ 0   $ 0  
Janesville Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss on Impairment         18,061
Fair Value     0   0
Fair value of equity method investment     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
Expected Term | Greenbrier Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Holding period       10 years  
Expected Term | EastGate Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Holding period       10 years  
Expected Term | Cary Towne Center | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Holding period       10 years  
Cap Rate | Greenbrier Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input (as a percent)   0.110   0.110  
Cap Rate | EastGate Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input (as a percent)   0.145   0.145  
Cap Rate | Cary Towne Center | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input (as a percent)   0.120   0.120  
Discount Rate | Greenbrier Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input (as a percent)   0.115   0.115  
Discount Rate | EastGate Mall | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input (as a percent)   0.150   0.150  
Discount Rate | Cary Towne Center | Malls          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value measurement input (as a percent)   0.13   0.13