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Other Investments (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]        
Equity method investments, carrying value $ 233,990,000   $ 254,172,000  
Interest income 33,219,000 $ 34,896,000    
Cost method investments 1,500,000   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 12,000,000   11,100,000  
Other real estate equity investments | Land & Development        
Schedule of Equity Method Investments [Line Items]        
Equity method investments, carrying value $ 68,600,000   64,000,000  
Other real estate equity investments | Minimum        
Schedule of Equity Method Investments [Line Items]        
iStar's ownership percentage 19.00%      
Other real estate equity investments | Maximum        
Schedule of Equity Method Investments [Line Items]        
iStar's ownership percentage 75.60%      
Real Estate Equity Investment | Land & Development        
Schedule of Equity Method Investments [Line Items]        
iStar's ownership percentage       85.70%
Equity method investments, carrying value $ 4,500,000   6,300,000  
Loans Commitments,Related Party 45,700,000      
Interest income 1,200,000 600,000    
Real Estate Equity Investment | Land & Development | Loans Receivable and Other Lending Investments, Net        
Schedule of Equity Method Investments [Line Items]        
Loans receivable, related party $ 34,500,000      
Net Lease Venture        
Schedule of Equity Method Investments [Line Items]        
iStar's ownership percentage 51.90%      
Equity method investments, carrying value $ 68,043,000   69,096,000  
Partners' capital account, contributions $ 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 $ 398,800,000   400,200,000  
Net Lease Venture | Other Income        
Schedule of Equity Method Investments [Line Items]        
Management fees revenue $ 400,000 $ 400,000    
Marina Palms        
Schedule of Equity Method Investments [Line Items]        
iStar's ownership percentage 47.50%      
Equity method investments, carrying value $ 23,091,000   30,099,000  
Total assets carrying value $ 230,800,000   $ 278,500,000