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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