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Unconsolidated Affiliates and Noncontrolling Interests (Noncontrolling Interests) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Operating Partnership    
Schedule of Equity Method Investments [Line Items]    
Noncontrolling interests $ 86,723 $ 86,773
Other consolidated subsidiaries    
Schedule of Equity Method Investments [Line Items]    
Noncontrolling interests 8,084 9,701
Unconsolidated Properties    
Schedule of Equity Method Investments [Line Items]    
Noncontrolling interests $ 94,807 $ 96,474