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Financing Activity - Mortgage Loan Activity (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 17, 2020
Sep. 26, 2019
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]                    
Mortgage loans, carrying value         $ 890,848     $ 890,848   $ 899,753
Gain (loss) on debt extinguishment, net         0   $ 29,600 $ 0 $ 24,832  
Mortgage Loan                    
Debt Instrument [Line Items]                    
Mortgage loan, repayment start period               2020-08    
Mortgage loan, repayment end period               2021-02    
Mortgage loans, carrying value         890,800     $ 890,800    
Mortgage Loan | Minimum                    
Debt Instrument [Line Items]                    
Deferral period, repayment of deferred amounts               4 months    
Mortgage Loan | Maximum                    
Debt Instrument [Line Items]                    
Deferral period, repayment of deferred amounts               6 months    
Capital City Mall Camp Hill Pennsylvania | Mortgage Loan                    
Debt Instrument [Line Items]                    
Mortgage loans, carrying value         $ 27,200     $ 27,200    
Gain (loss) on debt extinguishment, net $ 7,000                  
Capital City Mall Camp Hill Pennsylvania | Commercial Real Estate | Mortgage Loan                    
Debt Instrument [Line Items]                    
Mortgage loan, repayment start period               2020-08    
Mortgage loan, repayment end period               2021-02    
Mortgage loans, carrying value           $ 27,300        
Mortgage loans, balloon payment not paid           $ 27,300        
Mortgage loans, maturity date           Jul. 01, 2020        
Gain (loss) on debt extinguishment, net       $ (4,800)            
Repayments of Debt       $ 58,500            
Capital City Mall Camp Hill Pennsylvania | Commercial Real Estate | Mortgage Loan | Minimum                    
Debt Instrument [Line Items]                    
Deferral period, repayment of deferred amounts               4 months    
Capital City Mall Camp Hill Pennsylvania | Commercial Real Estate | Mortgage Loan | Maximum                    
Debt Instrument [Line Items]                    
Deferral period, repayment of deferred amounts               6 months    
Wyoming Valley Mall | Commercial Real Estate | Mortgage Loan                    
Debt Instrument [Line Items]                    
Debt default, amount   $ 72,800                
Repayments of cash and escrow balance   $ 7,500                
Asset impairment loss     $ 32,200              
Written off remaining carrying value of property     $ 43,200              
Gain (loss) on debt extinguishment, net             $ 29,600