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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Leasing revenues $ 200,731   $ 621,016  
Revenues from contracts with customers (ASC 606): 5,464   17,458  
Other revenues 1,822 $ 1,251 6,448 $ 4,079
Total revenues 206,878 224,650 641,676 691,896
Malls        
Disaggregation of Revenue [Line Items]        
Total revenues 188,440 205,020 585,097 632,830
All Other        
Disaggregation of Revenue [Line Items]        
Total revenues 18,438 $ 19,630 56,579 $ 59,066
Operating expense reimbursements        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1,682   6,062  
Operating expense reimbursements | Malls        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1,621   5,660  
Operating expense reimbursements | All Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 61   402  
Management, development and leasing fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 2,658   8,022  
Marketing        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1,124   3,374  
Marketing | Malls        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 1,119   3,362  
Marketing | All Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (ASC 606): 5   12  
Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 683   $ 3,202