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Equity Investments - Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 2,290,095 $ 1,527,054
Marketable securities 26,754 35,600
Other equity investments 96,833 348,342
Investments in Unconsolidated Ventures 2,446,336 1,690,839
Investment ventures    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 2,151,847 1,297,180
Other equity investments 95,196 89,261
Private funds    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 138,248 229,874
Other equity investments $ 34,291 $ 38,924