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Combined Guarantor Subsidiaries - Fair Value Measurements - Impairment of Real Estate Properties (Details)
$ in Thousands
3 Months Ended 6 Months Ended
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  
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  
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  
Guarantor Subsidiaries        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loss on Impairment $ 0 $ 0 $ 22,770 $ 0
Fair Value 56,300   56,300  
Guarantor Subsidiaries | 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  
Equity method investments at fair value $ 56,300   $ 56,300  
Holding period     10 years  
Guarantor Subsidiaries | 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  
Guarantor Subsidiaries | 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