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Real Estate - Net Lease Venture (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain on consolidation of equity method investment | $ 67,900 | $ 0 | $ 0 | $ 67,877
Equity method investment, partner ownership percentage |  | 47.50% |  |
Net Lease | iStar Net Lease I LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity interest |  | 51.90% |  |
Equity method investment, related party ownership percentage |  | 0.60% |  |
Equity method investment, related party promote fee percentage |  | 50.00% |  |

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