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Other Investments (Other Investments and Share of Earnings (Loss) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Distributions from other investments |  |  | $ 49,672 | $ 92,482 | $ 119,854
Carrying value |  |  | 321,241 | 214,406 |
Earnings (loss) from equity method investments |  |  | 13,015 | 77,349 | 32,153
Net proceeds from sale of other investments |  |  | 0 | 43,936 | 0
iStar Net Lease I LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Distributions from other investments | $ 13,200 | $ 61,200 | 26,000 |  |
Other real estate equity investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  | 11,600 |
Net proceeds from sale of other investments |  |  |  | 39,800 |
Recognized earnings |  |  |  | 31,500 |
Other Strategic Investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value |  |  | 13,618 | 33,350 |
Earnings (loss) from equity method investments |  |  | 1,410 | 9,907 | 8,586
Oak Hill Funds Group |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  | 4,300 | 2,200
Real Estate Investment |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value |  |  | 307,623 | 181,056 |
Earnings (loss) from equity method investments |  |  | 11,605 | 67,442 | 23,567
Real Estate Investment | iStar Net Lease I LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value |  |  | 121,139 | 92,669 |
Earnings (loss) from equity method investments |  |  | 4,534 | 3,567 | 5,221
Real Estate Investment | Safety, Income and Growth, Inc. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value |  |  | 83,868 | 0 |
Earnings (loss) from equity method investments |  |  | 551 | 0 | 0
Real Estate Investment | Marina Palms |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value |  |  | 2,555 | 35,185 |
Earnings (loss) from equity method investments |  |  | 2,621 | 22,053 | 23,626
Real Estate Investment | Other real estate equity investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying value |  |  | 100,061 | 53,202 |
Earnings (loss) from equity method investments |  |  | $ 3,899 | 41,822 | $ (5,280)
Noncontrolling Interests |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Recognized earnings |  |  |  | $ 10,100 |

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