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UNCONSOLIDATED AFFILIATES - Joint Ventures (Details)
 1 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2019
USD ($)
Oct. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Aug. 31, 2019
USD ($)
May 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
yr
May 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Oct. 31, 2017
USD ($)
Aug. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
yr
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 31, 2019
USD ($)
Nov. 30, 2018
Sep. 29, 2018
USD ($)
Sep. 30, 2017
Apr. 30, 2017
Schedule Of Equity Method Investments [Line Items]                                          
Gain on sales of real estate assets                           $ 16,274,000 $ 19,001,000 $ 93,792,000          
Loss on impairment                           239,521,000 174,529,000 71,401,000          
Net proceeds from disposal of investments                           $ 18,563,000   $ 9,000,000          
Corporate Joint Venture                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)                                         25.00%
Minimum                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)                           20.00%              
Maximum                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)                           65.00%              
G&I VIII CBL Triangle LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Real estate investments             $ 0           $ 0                
Loss on impairment             89,826,000           1,022,000                
Fair value of real estate joint ventures             $ 33,600,000           $ 33,600,000           $ 123,453,000    
Measurement Input, Expected Term | G&I VIII CBL Triangle LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Fair value measurement input (as a percent) | yr             10           10                
Cap Rate (as a percent) | G&I VIII CBL Triangle LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Fair value measurement input (as a percent)             0.15           0.15                
Discount Rate (as a percent) | G&I VIII CBL Triangle LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Fair value measurement input (as a percent)             0.15           0.15                
Atlanta Outlet JV, LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Proportion of ownership in variable interest entity sold (as a percent)                           25.00%              
Proceeds from sale of land                           $ 20,778,000              
Related debt as part of proceeds from sale of land                           $ 11,440,000              
Ownership interest in joint venture (as a percent)                           50.00%              
Gain (loss) on investment/deconsolidation                           $ 56,067,000              
Gain on sales of real estate assets                           $ 12,939,000              
Proportion of ownership in variable interest entity sold (as a percent)                           25.00%              
Gain (loss) related to marking investment to fair value                           $ 43,128,000              
BI Development, LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership in variable interest entity (as a percent)                           20.00%              
Bullseye LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership in variable interest entity (as a percent)                           20.00%              
El Paso Outlet Center Holding, LLC and El Paso Outlet Outparcels, LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Proportion of ownership in variable interest entity sold (as a percent)       25.00%                                  
Proceeds from sale of land       $ 27,750,000                                  
Related debt as part of proceeds from sale of land       $ 18,525,000                                  
Ownership interest in joint venture (as a percent)       50.00%                                  
Gain (loss) on investment/deconsolidation       $ 11,174,000                                  
Gain on sales of real estate assets       3,884,000                                  
Gain (loss) related to marking investment to fair value       7,290,000                                  
G&I VIII CBL Triangle LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)                                 90.00%        
Real estate investments                                 $ 0        
Hamilton Place Self Storage, LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)     54.00%                                    
Gain on sales of real estate assets     $ 187,000                                    
Total Outstanding     $ 7,002,000                                    
Maximum guarantee (as a percent)     100.00%                     100.00%              
Maximum guarantee, backup guaranty (as a percent)     50.00%                                    
Hamilton Place Self Storage, LLC | LIBOR                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)     2.75%                                    
Mall of South Carolina L.P.                                          
Schedule Of Equity Method Investments [Line Items]                                          
Total Outstanding $ 7,959,000                                        
Debt Fixed Interest Rate 5.05%                                        
Debt Instrument, Maturity Date Nov. 30, 2024                                        
Parkdale Self Storage, LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)         50.00%                                
Gain on sales of real estate assets         $ 433,000                                
Total Outstanding         $ 6,500,000                                
Maximum guarantee (as a percent)         100.00%                                
Stated interest rate (as a percent)         5.25%                                
Parkdale Self Storage, LLC | LIBOR                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)         2.80%                                
Parkdale Self Storage L L C                                          
Schedule Of Equity Method Investments [Line Items]                                          
Maximum guarantee (as a percent)                           100.00%              
Debt Instrument, Maturity Date         Jul. 31, 2024                                
Vision-CBL Hamilton Place, LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)                                   50.00%      
Gain on sales of real estate assets                           $ 1,381,000              
Total Outstanding   $ 16,800,000                                      
Debt Instrument, Maturity Date   Nov. 30, 2024                                      
Vision-CBL Hamilton Place, LLC | LIBOR                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)   2.45%                                      
CBL/T-C, LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Debt Fixed Interest Rate                 4.84%                        
Proceeds from the loan were used to retire                 $ 97,732,000                        
Debt Instrument, Interest Rate                 6.98%                        
CBL/T-C, LLC | CoolSprings Galleria                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)                 50.00%                        
Non-recourse loan secured                 $ 155,000,000                        
Continental 425 Fund LLC | Total Shareholders' Equity                                          
Schedule Of Equity Method Investments [Line Items]                                          
Total Outstanding           $ 36,990,000                 $ 36,990,000            
Debt Instrument, Maturity Date           Dec. 31, 2021                              
Capital contribution, land           $ 6,000,000                              
Cash contributed           $ 7,000                              
Membership units owned (as a percent)           43.50%                              
Continental 425 Fund LLC | LIBOR | Total Shareholders' Equity                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)           2.35%                              
Pavilion at Port Orange | Total Shareholders' Equity                                          
Schedule Of Equity Method Investments [Line Items]                                          
Secured Loan               $ 56,738,000                          
Hammock Landing – Phase I | Total Shareholders' Equity                                          
Schedule Of Equity Method Investments [Line Items]                                          
Secured Loan               41,997,000                          
Hammock Landing – Phase II | Total Shareholders' Equity                                          
Schedule Of Equity Method Investments [Line Items]                                          
Secured Loan               $ 16,217,000                          
Port Orange Town Center LLC, West Melbourne Town Center LLC and West Melbourne Holdings II, LLC | Total Shareholders' Equity                                          
Schedule Of Equity Method Investments [Line Items]                                          
Maximum guarantee (as a percent)               50.00%                          
Port Orange Town Center LLC, West Melbourne Town Center LLC and West Melbourne Holdings II, LLC | LIBOR | Total Shareholders' Equity | Minimum                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)               2.00%                          
Port Orange Town Center LLC, West Melbourne Town Center LLC and West Melbourne Holdings II, LLC | LIBOR | Total Shareholders' Equity | Maximum                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)               2.25%                          
G&l Vlll CBL Triangle                                          
Schedule Of Equity Method Investments [Line Items]                                          
Gain (loss) on investment/deconsolidation                 387,000                        
Total Outstanding                 $ 5,987,000                        
G&l Vlll CBL Triangle | LIBOR                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)                 2.75%                        
Ambassador Infrastructure, LLC                                          
Schedule Of Equity Method Investments [Line Items]                                          
Total Outstanding       $ 11,035,000                                  
Amount of loan guaranteed by the company (as a percent)       100.00%                                  
Ambassador Infrastructure, LLC | Interest Rate Swap                                          
Schedule Of Equity Method Investments [Line Items]                                          
Notional amount of interest rate swaps held       $ 9,360,000                                  
Fixed interest rate (as a percent)       3.74%                                  
Ambassador Infrastructure, LLC | LIBOR                                          
Schedule Of Equity Method Investments [Line Items]                                          
Stated interest rate (as a percent)       2.00%                                  
G&l Vlll CBL Triangle                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)                                       25.00%  
Loss on sale of investment                       $ 354,000 $ 5,843,000                
Net proceeds from disposal of investments                         $ 9,000,000                
Shoppes at Eagle Point, LLC | Corporate Joint Venture                                          
Schedule Of Equity Method Investments [Line Items]                                          
Total Outstanding                     $ 36,400,000                    
Cash contributed by third party                     $ 1,031,000                    
Shoppes at Eagle Point, LLC | LIBOR | Corporate Joint Venture                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)                     2.75%                    
EastGate Storage, LLC | Total Shareholders' Equity                                          
Schedule Of Equity Method Investments [Line Items]                                          
Total Outstanding                   $ 6,500,000                      
Capital contribution, land                   $ 1,134,000                      
EastGate Storage, LLC | LIBOR | Total Shareholders' Equity                                          
Schedule Of Equity Method Investments [Line Items]                                          
Basis spread on variable rate (as a percent)                   2.75%                      
Gulf Coast Town Center Phase I I I                                          
Schedule Of Equity Method Investments [Line Items]                                          
Ownership interest in joint venture (as a percent)                               50.00%