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Other Investments (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Sep. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments, carrying value |  | $ 228,756,000 |  | $ 228,756,000 |  | $ 254,172,000 |
Distributions from other investments |  |  |  | 8,632,000 | $ 67,358,000 |  |
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 |  |
Other real estate equity investments | Operating Properties |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments, carrying value |  | 13,100,000 |  | 13,100,000 |  | 11,100,000 |
Other real estate equity investments | Land & Development |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments, carrying value |  | $ 59,200,000 |  | $ 59,200,000 |  | 64,000,000 |
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 | Land & Development |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  | 85.70%
Equity method investments, carrying value |  | $ 2,100,000 |  | $ 2,100,000 |  | 6,300,000 |
Loans commitments, related party |  | 45,700,000 |  | 45,700,000 |  |  |
InterestAndFeeIncomeLoansCommercialRelatedParty |  | 1,200,000 | $ 1,000,000 | 2,400,000 | 1,600,000 |  |
Real Estate Equity Investment | Land & Development | Loans Receivable and Other Lending Investments, Net |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Loans receivable, related party |  | $ 35,600,000 |  | $ 35,600,000 |  |  |
Net Lease Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  | 51.90% |  | 51.90% |  |  |
Equity method investments, carrying value |  | $ 67,895,000 |  | $ 67,895,000 |  | 69,096,000 |
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% |  |  |
Total assets carrying value |  | $ 414,200,000 |  | $ 414,200,000 |  | 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 | $ 800,000 | 800,000 |  |
Marina Palms |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  | 47.50% |  | 47.50% |  |  |
Equity method investments, carrying value |  | $ 27,558,000 |  | $ 27,558,000 |  | 30,099,000 |
Total assets carrying value |  | $ 207,600,000 |  | $ 207,600,000 |  | $ 278,500,000 |
Net Lease | Net Lease Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |  |  |
Debt instrument, face amount | $ 120,000,000.0 |  | $ 120,000,000.0 |  | $ 120,000,000.0 |  |

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