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REVENUES - Disaggregation of Revenue (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]                      
Rental revenues                 $ 736,878,000 $ 829,113,000 $ 909,595,000
Revenues from contracts with customers (ASC 606):                 25,192,000 25,262,000  
Total revenues $ 190,038,000 $ 187,251,000 $ 193,377,000 $ 198,030,000 $ 216,881,000 $ 206,878,000 $ 214,598,000 $ 220,200,000 768,696,000 [1] 858,557,000 [1] 927,252,000 [1]
Malls                      
Disaggregation Of Revenue [Line Items]                      
Total revenues [1]                 699,698,000 783,194,000 $ 847,979,000
Operating expense reimbursements                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 9,783,000 8,434,000  
Operating expense reimbursements | Malls                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 9,404,000 5,873,000  
Operating expense reimbursements | All Other                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 379,000 2,561,000  
Management, development and leasing fees                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 9,350,000 10,542,000  
Marketing revenues                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                 6,059,000 6,286,000  
Marketing revenues | Malls                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                   6,255,000  
Marketing revenues | All Other                      
Disaggregation Of Revenue [Line Items]                      
Revenues from contracts with customers (ASC 606):                   31,000  
Other revenues                      
Disaggregation Of Revenue [Line Items]                      
Total revenues                 $ 6,626,000 $ 4,182,000  
[1] Management, development and leasing fees are included in All Other category. See Note 3 for information on the Company’s revenues disaggregated by revenue source for each of the above segments.