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Other Investments - Schedule of Other Investments (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | $ 1,049,930 |  | $ 1,049,930 |  | $ 907,875
Equity (Losses) in Earnings | $ 2,586 | $ 3,640 | 19,198 | $ 8,949 |
Mark-to-market gain |  |  | $ 9,900 |  |
SAFE |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of shares owned (in shares) | 33.4 |  | 33.4 |  |
Closing price (in USD per share) | $ 57.49 |  | $ 57.49 |  |
Market value | $ 1,900,000 |  | $ 1,900,000 |  |
Dilution gain |  |  | 7,900 |  |
Other strategic investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 56,838 |  | 56,838 |  | 43,253
Equity (Losses) in Earnings | (1,321) | (235) | (2,158) | (33) |
Real estate equity investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value | 993,092 |  | 993,092 |  | 864,622
Equity (Losses) in Earnings | 3,907 | 3,875 | 21,356 | 8,982 |
Real estate equity investments | SAFE |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value | 839,557 |  | 839,557 |  | 729,357
Equity (Losses) in Earnings | 8,236 | 3,814 | 27,574 | 11,130 |
Real estate equity investments | iStar Net Lease II LLC (Net Lease Venture II) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value | 58,833 |  | 58,833 |  | 30,712
Equity (Losses) in Earnings | 564 | (232) | 757 | (318) |
Real estate equity investments | Other real estate equity investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value | 94,702 |  | 94,702 |  | $ 104,553
Equity (Losses) in Earnings | $ (4,893) | $ 293 | $ (6,975) | $ (1,830) |

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