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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Rental revenues $ 185,393 $ 207,568 $ 376,373 $ 420,297
Revenues from contracts with customers (ASC 606): 5,865 5,739 11,405 12,098
Total revenues 193,377 214,598 391,407 434,798
Malls        
Disaggregation of Revenue [Line Items]        
Total revenues 170,976 195,942 354,840 396,657
All Other        
Disaggregation of Revenue [Line Items]        
Total revenues 22,401 18,656 36,567 38,141
Operating expense reimbursements        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 2,061 2,168 4,204 4,511
Operating expense reimbursements | Malls        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1,217 927 2,093 2,221
Operating expense reimbursements | All Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1 1 (1) 2
Management, development and leasing fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 2,586 2,643 5,109 5,364
Marketing revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1,218 928 2,092 2,223
Marketing revenues | Malls        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1,892 2,083 4,084 4,273
Marketing revenues | All Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 169 85 120 238
Other revenues        
Disaggregation of Revenue [Line Items]        
Other revenues $ 2,119 $ 1,291 $ 3,629 $ 2,403