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Revenues - Disaggregation of Revenue (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation Of Revenue [Line Items]    
Rental revenues $ 161,173,000 $ 190,980,000
Revenues from contracts with customers (ASC 606): 5,224,000 5,540,000
Total revenues [1] 167,574,000 198,030,000
Malls    
Disaggregation Of Revenue [Line Items]    
Total revenues [1] 153,351,000 183,864,000
Operating expense reimbursements    
Disaggregation Of Revenue [Line Items]    
Revenues from contracts with customers (ASC 606): 2,389,000 2,143,000
Operating expense reimbursements | Malls    
Disaggregation Of Revenue [Line Items]    
Revenues from contracts with customers (ASC 606): 2,321,000 2,192,000
Operating expense reimbursements | All Other Segments    
Disaggregation Of Revenue [Line Items]    
Revenues from contracts with customers (ASC 606): 68,000 (49,000)
Management, development and leasing fees    
Disaggregation Of Revenue [Line Items]    
Revenues from contracts with customers (ASC 606): 2,092,000 2,523,000
Marketing revenues    
Disaggregation Of Revenue [Line Items]    
Revenues from contracts with customers (ASC 606): 743,000 874,000
Other revenues    
Disaggregation Of Revenue [Line Items]    
Total revenues $ 1,177,000 $ 1,510,000
[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.