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Equity Investments - Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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