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Revenues - Disaggregation of Revenue (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation Of Revenue [Line Items]        
Rental revenues $ 120,222,000 $ 185,393,000 $ 281,395,000 $ 376,373,000
Revenues from contracts with customers (ASC 606): 3,509,000 5,865,000 8,733,000 11,405,000
Total revenues [1] 124,211,000 193,377,000 291,785,000 391,407,000
Malls        
Disaggregation Of Revenue [Line Items]        
Total revenues [1] 112,002,000 170,976,000 265,353,000 354,840,000
Operating expense reimbursements        
Disaggregation Of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 2,103,000 2,061,000 4,492,000 4,204,000
Operating expense reimbursements | Malls        
Disaggregation Of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 2,024,000 1,892,000 4,345,000 4,084,000
Operating expense reimbursements | All Other Segments        
Disaggregation Of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 79,000 169,000 147,000 120,000
Management, development and leasing fees        
Disaggregation Of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1,055,000 2,586,000 3,147,000 5,109,000
Marketing revenues        
Disaggregation Of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 351,000 1,218,000 1,094,000 2,092,000
Other revenues        
Disaggregation Of Revenue [Line Items]        
Total revenues $ 480,000 $ 2,119,000 $ 1,657,000 $ 3,629,000
[1] Management, development and leasing fees are included in the All Other category. See Note 3 for information on the Company's revenues disaggregated by revenue source for each of the above segments.