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Investments in Unconsolidated Entities - Asian Joint Ventures (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investment in Unconsolidated Entities    
Equity investment $ 2,374,693 $ 2,367,583
Japan | Mitsubishi Estate Co., Ltd. | Premium Outlets    
Investment in Unconsolidated Entities    
Ownership percentage 40.00%  
Equity investment $ 239,000 227,500
South Korea | Shinsegae International Co | Premium Outlets    
Investment in Unconsolidated Entities    
Ownership percentage 50.00%  
Equity investment $ 136,400 $ 130,900