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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