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FAIR VALUE MEASUREMENTS - Long-Lived Assets Measured at Fair Value (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 7 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
office_building
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
mall
Dec. 31, 2017
USD ($)
mall
outparcel
Dec. 31, 2016
USD ($)
property
office_building
mall
outparcel
store
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                                   $ 71,285 $ 174,529 $ 71,401 $ 116,822    
Number of malls with impairment (mall) | mall                                     5 2 9    
Fair Value                   $ 91,841       $ 46,200         $ 91,841 $ 81,350 $ 46,200    
Assets                   5,340,853       6,104,640         5,340,853 $ 5,704,808 $ 6,104,640    
Number of stores with Impairment (outparcel) | outparcel                                       1 3    
Number of office buildings with impairment (office building) | office_building                                         3    
Mortgage and other indebtedness, net                   4,043,180                 4,043,180 $ 4,230,845      
Cary Towne Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                   2,693 $ 51,983                        
Eastland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                   36,525                          
Honey Creek Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                   48,640                          
Acadiana Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                         $ 43,007                    
Hickory Point Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                       $ 24,525                      
Outparcel Sale                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Non-cash impairment of long-lived asset                                         $ 854    
Number of properties disposed of (property) | property                                         3    
Bonita Lakes Mall and Crossing                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                 $ 5,323                            
Fair Value                 0             $ 0             $ 0
Assets                 27,440             27,440             $ 27,440
Concentration risk (as a percent)                                             0.70%
Purchase Price                           27,910             $ 27,910    
Midland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                 4,681                            
Fair Value                 $ 29,200             29,200             $ 29,200
Concentration risk (as a percent)                                         0.60%    
Estimated selling costs relative to total fair value (as a percent)                 2.00%                            
River Ridge Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                 $ 9,594         84   9,510              
Fair Value                 $ 0             0             $ 0
Concentration risk (as a percent)                 0.60%                            
Reserve for future capital expenditures                               $ 2,100              
The Lakes and Fashion Square                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment               $ 32,096                              
Fair Value               0                              
Assets                           65,447             $ 65,447    
Concentration risk (as a percent)                                         1.60%    
Purchase Price                           66,500             $ 66,500    
Wausau Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment               10,738                              
Fair Value               $ 11,000                              
Concentration risk (as a percent)                                         0.30%    
Number of stores sold | store                                         2    
Estimated selling costs relative to total fair value (as a percent)                                         4.00%    
Randolph Mall, Regency Mall, and Walnut Square                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment             $ 43,144             (150) $ 43,294                
Number of malls with impairment (mall) | mall                                         3    
Fair Value             0               0             $ 0  
Assets             31,318               31,318             $ 31,318  
Concentration risk (as a percent)                                           1.50%  
Purchase Price                           32,250             $ 32,250    
One and Two Oyster Point                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment             3,844                                
Fair Value             $ 6,000               6,000             $ 6,000  
Concentration risk (as a percent)                                         0.30%    
Number of office buildings with impairment (office building) | office_building             2                                
Estimated selling costs relative to total fair value (as a percent)             2.00%                                
Oak Branch Business Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment             $ 100             (22) 122                
Fair Value             0               0             0  
Cobblestone Village at Palm Coast                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment             6,448             150 6,298                
Fair Value             $ 0               $ 0             $ 0  
Concentration risk (as a percent)                                           0.10%  
Estimated selling costs relative to total fair value (as a percent)                             2.00%                
Non-Recourse Loans on Operating Properties | Wausau Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Mortgage and other indebtedness, net                           $ 17,689             $ 17,689    
Malls | Janesville Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment     $ 18,061                                        
Fair Value     $ 0                                        
Investment in consolidated joint venture, fair value   $ 17,640                 17,640                        
Malls | Cary Towne Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment   54,678                                          
Fair Value   $ 30,971                 $ 30,971                        
Malls | Acadania Mall - Macy's & Land                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                                     1,593        
Fair Value                   3,920                 3,920        
Investment in consolidated joint venture, fair value                   3,920                 3,920        
Malls | Eastland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                                     36,525        
Fair Value                   26,450                 26,450        
Investment in consolidated joint venture, fair value                   26,450                 26,450        
Malls | Honey Creek Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                                     48,640        
Fair Value                   16,400                 16,400        
Investment in consolidated joint venture, fair value                   16,400                 16,400        
Malls | Woodstock, GA - Land                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment           $ 3,147                                  
Fair Value           0                                  
Investment in consolidated joint venture, fair value           $ 1,000                                  
Malls | Acadiana Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment         $ 43,007                                    
Fair Value         67,300               67,300                    
Investment in consolidated joint venture, fair value         $ 67,300               $ 67,300                    
Concentration risk (as a percent)                                       1.90%      
Malls | Hickory Point Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment       $ 24,525                                      
Fair Value       14,050               14,050         $ 14,050 14,050          
Concentration risk (as a percent)                                       0.50%      
Malls/ All Other                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                                 606            
Fair Value       $ 0               $ 0         $ 0 $ 0          
Malls/ All Other | D'Ibervilee, MS - Land                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment $ 14,598                                            
Fair Value $ 8,100                                            
Investment in consolidated joint venture, fair value                   8,100                 8,100        
Malls/ All Other | Pavilion at Port Orange - Land                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                                     434        
Fair Value                   $ 6,000                 $ 6,000        
Retail Site                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                                         $ 115,968    
Outparcel Sale                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Loss on impairment                                       $ 116      
Number of stores sold | outparcel                                       1      
Expected Term | Midland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                         10 years    
Expected Term | Wausau Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                         10 years    
Expected Term | Minimum | One and Two Oyster Point                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                         1 year    
Expected Term | Maximum | One and Two Oyster Point                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                         2 years    
Expected Term | Malls | Cary Towne Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                     10 years        
Expected Term | Malls | Eastland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                     10 years        
Expected Term | Malls | Honey Creek Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                     10 years        
Expected Term | Malls | Acadiana Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                       10 years      
Expected Term | Malls | Hickory Point Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Holding period                                       10 years      
Cap Rate | Midland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)                 0.0975             0.0975             0.0975
Cap Rate | Wausau Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)                           0.1325             0.1325    
Cap Rate | One and Two Oyster Point                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)                           0.080             0.080    
Cap Rate | Cobblestone Village at Palm Coast                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)             0.090               0.090             0.090  
Cap Rate | Malls | Cary Towne Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)   0.120                 0.120                        
Cap Rate | Malls | Eastland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)   0.150                 0.150                        
Cap Rate | Malls | Honey Creek Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)   0.180                 0.180                        
Cap Rate | Malls | Acadiana Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)         0.155               0.155                    
Cap Rate | Malls | Hickory Point Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)       0.180               0.180         0.180 0.180          
Discount Rate | Midland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)                 0.115             0.115             0.115
Discount Rate | Wausau Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)                           0.130             0.130    
Discount Rate | One and Two Oyster Point                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)                           0.100             0.100    
Discount Rate | Cobblestone Village at Palm Coast                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)             0.1075               0.1075             0.1075  
Discount Rate | Malls | Cary Towne Center                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)   0.13                 0.13                        
Discount Rate | Malls | Eastland Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)   0.170                 0.170                        
Discount Rate | Malls | Honey Creek Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)   0.200                 0.200                        
Discount Rate | Malls | Acadiana Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)         0.1575               0.1575                    
Discount Rate | Malls | Hickory Point Mall                                              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                              
Measurement input (as a percent)       0.190               0.190         0.190 0.190