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Beneficial Interest in Debt and Interest Expense (Specific Debt Instrument Detail) (Details)
6 Months Ended
Jun. 30, 2017
USD ($)
The Mall of San Juan [Member]  
Debt Instrument [Line Items]  
Construction Loan $ 302,400,000
Unsecured Debt Secondary Term Loan [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Description of Variable Rate Basis LIBOR
Unsecured Debt $ 300,000,000
Debt Instrument, Maturity Date, Description February 2022
Maximum Borrowing Capacity Including Accordion Feature $ 2,000,000
Secondary Line of Credit [Member]  
Debt Instrument [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 65,000,000
Length Of Extension Option one year
Line of Credit [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Maturity Date, Description February 2021
Number of Extension Options two
Line of Credit Facility, Maximum Borrowing Capacity $ 1,100,000,000
Maximum Borrowing Capacity Including Accordion Feature $ 2,000,000,000
Length Of Extension Option six-month
Unsecured Debt [Member]  
Debt Instrument [Line Items]  
Unsecured Debt $ 475,000,000
Maximum [Member] | Unsecured Debt Secondary Term Loan [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 1.90%
Minimum [Member] | Unsecured Debt Secondary Term Loan [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 1.25%