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Other Investments (Narrative) (Details) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) unit | Mar. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Earnings from equity method investments |  | $ 5,702,000 | $ 8,267,000
Equity method investments, carrying value | $ 214,406,000 | 197,559,000 |
Contributions |  | 1,813,000 | 6,377,000
Cost method investments | 1,400,000 | $ 900,000 |
Net lease venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
iStar's ownership percentage |  | 51.90% |
Partners' capital account, contributions (up to) |  | $ 500,000,000 |
Equity method investment, related party ownership percentage |  | 0.60% |
Equity method investment, related party promote fee percentage |  | 50.00% |
Equity method investment, partner ownership percentage |  | 47.50% |
Total assets carrying value | 511,300,000 | $ 516,500,000 |
Net lease venture | Other income |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Management fees revenue |  | $ 500,000 | $ 400,000
Marina Palms |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
iStar's ownership percentage |  | 47.50% |
Total assets carrying value | 201,800,000 | $ 98,300,000 |
Number of units | unit |  | 468 |
Marine Palms North Tower |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of units | unit |  | 234 |
Marine Palms South Tower |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of units | unit |  | 234 |
Percentage of units pre-sold |  | 84.00% |
Other real estate equity investments | Operating Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments, carrying value | 3,600,000 | $ 3,200,000 |
Contributions | 7,000,000 |  |
Loan commitments | 27,000,000 |  |
Loans receivable, carrying value | 22,700,000 | 23,100,000 |
Interest income |  | 400,000 |
Other real estate equity investments | Land & Development |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments, carrying value | $ 49,600,000 | $ 50,000,000 |
Other real estate equity investments | Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
iStar's ownership percentage |  | 20.00% |
Other real estate equity investments | Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
iStar's ownership percentage |  | 85.00% |
Newly formed unconsolidated entity |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
iStar's ownership percentage | 50.00% |  |

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