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Other Investments - Schedule of Other Investments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Other investments | $ 521,999 |  | $ 304,275
Equity in earnings (losses) | 5,309 | $ 3,332 |
Other strategic investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other investments | 7,227 |  | 7,516
Equity in earnings (losses) | 202 | (494) |
Real estate equity investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying value | 514,772 |  | 296,759
Equity in earnings (losses) | 5,107 | 3,826 |
Real estate equity investments | Safehold Inc. (SAFE) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying value | 402,052 |  | 149,589
Equity in earnings (losses) | 7,316 | 1,472 |
Real estate equity investments | iStar Net Lease II LLC (Net Lease Venture II) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying value | 5,630 |  | 16,215
Equity in earnings (losses) | (86) | 0 |
Real estate equity investments | iStar Net Lease I LLC (Net Lease Venture) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying value | 0 |  | 0
Equity in earnings (losses) | 0 | 2,084 |
Real estate equity investments | Other real estate equity investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying value | 107,090 |  | $ 130,955
Equity in earnings (losses) | $ (2,123) | $ 270 |

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