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Unconsolidated Affiliates and Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Operating Partnership    
Schedule of Equity Method Investments [Line Items]    
Noncontrolling interests $ 46,892 $ 55,917
Other consolidated subsidiaries    
Schedule of Equity Method Investments [Line Items]    
Noncontrolling interests 11,079 12,111
Unconsolidated Properties    
Schedule of Equity Method Investments [Line Items]    
Noncontrolling interests $ 57,971 $ 68,028