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Other Investments (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) unit | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) property unit | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Contributions |  |  |  | $ 45,635,000 | $ 9,304,000 |  |
Distributions from other investments |  |  |  | 25,795,000 | 93,156,000 |  |
Equity method investments, carrying value |  | $ 262,496,000 |  | 262,496,000 |  | $ 254,172,000 |
Earnings from equity method investments |  | 26,540,000 | $ 10,572,000 | 74,254,000 | 25,904,000 |  |
Cost method investments |  | $ 1,400,000 |  | $ 1,400,000 |  | 1,500,000 |
Proceeds from sale of available-for-sale securities, equity |  |  |  |  | 7,300,000 |  |
Available-for-sale securities, gross realized gains |  |  |  |  | 2,500,000 |  |
Net Lease Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  | 51.90% |  | 51.90% |  |  |
Partners' capital account, contributions (up to) |  | $ 500,000,000 |  | $ 500,000,000 |  |  |
Equity method investment, related party ownership percentage |  | 0.60% |  | 0.60% |  |  |
Equity method investment, related party promote fee percentage |  | 50.00% |  | 50.00% |  |  |
Equity method investment, partner ownership percentage |  | 47.50% |  | 47.50% |  |  |
Number of properties | property |  |  |  | 2 |  |  |
Contributions |  |  |  | $ 35,600,000 |  |  |
Total assets carrying value |  | $ 493,300,000 |  | 493,300,000 |  | 400,200,000 |
Distributions from other investments | $ 61,200,000 |  |  |  |  |  |
Net Lease Venture | Other Income |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Management fees revenue |  | $ 400,000 | 400,000 | $ 1,200,000 | 1,100,000 |  |
Net Lease Venture | Net Lease |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Debt term | 10 years |  |  |  |  |  |
Debt instrument, face amount | $ 120,000,000.0 |  |  |  |  |  |
Marina Palms |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  | 47.50% |  | 47.50% |  |  |
Total assets carrying value |  | $ 202,300,000 |  | $ 202,300,000 |  | 278,500,000 |
Number of units | unit |  | 468 |  | 468 |  |  |
Marine Palms North Tower |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of units | unit |  | 234 |  | 234 |  |  |
Marine Palms South Tower |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of units | unit |  | 234 |  | 234 |  |  |
Percentage of units pre-sold |  |  |  | 75.00% |  |  |
Other real estate equity investments |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Earnings from equity method investments |  | $ 15,800,000 |  | $ 11,600,000 |  |  |
Equity method investment, realized gain on disposal |  |  |  | 31,500,000 |  |  |
Other real estate equity investments | Operating Properties |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments, carrying value |  | 12,700,000 |  | 12,700,000 |  | 11,100,000 |
Other real estate equity investments | Land & Development |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments, carrying value |  | $ 60,200,000 |  | $ 60,200,000 |  | 70,400,000 |
Other real estate equity investments | Minimum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  | 19.00% |  | 19.00% |  |  |
Other real estate equity investments | Maximum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  | 85.00% |  | 85.00% |  |  |
Real Estate Equity Investment |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Earnings from equity method investments |  | $ 15,800,000 |  | $ 11,600,000 |  |  |
Real Estate Equity Investment | Land & Development |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  | 50.00% |  | 50.00% |  |  | 85.70%
Equity method investments, carrying value |  | $ 0 |  | $ 0 |  | 6,300,000 |
Loans commitments, related party |  |  |  |  |  |  | $ 45,700,000
Interest income |  | $ 1,300,000 | $ 1,100,000 | $ 3,600,000 | $ 2,800,000 |  |
Real Estate Equity Investment | Land & Development | Loans Receivable and Other Lending Investments, Net |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Loans receivable, related party |  |  |  |  |  | $ 33,700,000 |

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