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Equity Investments - Equity Method Investments (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) investment | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments (less than for 16 individual other investments) | $ 2,290,095 | $ 1,527,054
Colony Credit |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage | 36.60% |
Equity method investments (less than for 16 individual other investments) | $ 1,037,754 | 0
NRE |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage | 11.20% |
Equity method investments (less than for 16 individual other investments) | $ 87,696 | 73,578
RXR Realty |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage | 27.20% |
Equity method investments (less than for 16 individual other investments) | $ 95,418 | 105,082
Preferred equity |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments (less than for 16 individual other investments) | 219,913 | 440,704
ADC investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments (less than for 16 individual other investments) | 481,477 | 331,268
Private funds and other |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments (less than for 16 individual other investments) | 110,610 | 25,101
Private funds—carried interest |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments (less than for 16 individual other investments) | 21,730 | 0
Other investment ventures |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments (less than for 16 individual other investments) | $ 154,412 | 187,420
Number of equity method investments | investment | 18 |
Individual other investment venture |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments (less than for 16 individual other investments) | $ 66,000 |
Fair value option |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments (less than for 16 individual other investments) | $ 81,085 | $ 363,901
Amended And Restated NRE Management Agreement | NRE |  |
Schedule of Equity Method Investments [Line Items] |  |
Maximum stock purchase eligibility, percent | 45.00% |
Shares owned in excess of threshold, threshold percent | 25.00% |

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