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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CBL Associates Properties Inc      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Potentially dilutive securities (shares) 0   0
Antidilutive shares/ units (shares) 0   0
CBL & Associates Limited Partnership      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Potentially dilutive securities (shares) 0   0
Antidilutive shares/ units (shares) 0   0
Performance Shares | CBL Associates Properties Inc      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Contingently issuable common shares/ units (shares)   102,820  
Performance Shares | CBL & Associates Limited Partnership      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Contingently issuable common shares/ units (shares)   102,820