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Other Investments (Narrative) (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
unit
Nov. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
property
unit
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
lease_asset
Feb. 28, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]              
Contributions to other investments       $ 58,197,000 $ 11,531,000 $ 159,424,000  
Noncontrolling interest, ownership percentage by parent 95.70%     95.70%      
Number of properties acquired | property       2      
Total assets $ 2,803,411,000     $ 2,803,411,000 3,597,587,000    
Distributions from other investments       92,482,000 119,854,000 61,031,000  
Carrying value 214,406,000     214,406,000 254,172,000    
Land development revenue       88,340,000 100,216,000 15,191,000  
Land development cost of sales       62,007,000 67,382,000 12,840,000  
Income from sales of real estate       105,296,000 93,816,000 89,943,000  
Earnings (loss) from equity method investments       77,349,000 32,153,000 94,905,000  
(Recovery of) provision for loan losses       (12,514,000) 36,567,000 (1,714,000)  
Cost investments 1,400,000     1,400,000 1,500,000    
Proceeds from sale of available-for-sale securities         7,400,000    
Available-for-sale securities, realized gain         2,600,000    
iStar Net Lease I LLC              
Schedule of Equity Method Investments [Line Items]              
Contributions to other investments       37,700,000      
Distributions from other investments   $ 13,200,000 $ 61,200,000        
iStar Net Lease I LLC | Net Lease              
Schedule of Equity Method Investments [Line Items]              
Debt instrument term   5 years 10 years        
Debt instrument, face amount   $ 29,000,000.0 $ 120,000,000.0        
iStar Net Lease I LLC | Net Lease              
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%
Net proceeds from sales of real estate           $ 10,100,000  
Noncontrolling interest, ownership percentage by parent           72.00%  
Transfer mortgage payable           $ 26,000,000  
Number of properties acquired | lease_asset           58  
Acquisitions of real estate assets           $ 200,000,000  
Total assets $ 511,300,000     511,300,000 400,200,000    
iStar Net Lease I LLC | Net Lease Asset One              
Schedule of Equity Method Investments [Line Items]              
Net proceeds from sales of real estate           93,700,000  
iStar Net Lease I LLC | Other Income              
Schedule of Equity Method Investments [Line Items]              
Management fees revenue       $ 1,600,000 1,500,000 1,300,000  
Marina Palms              
Schedule of Equity Method Investments [Line Items]              
iStar's ownership percentage 47.50%     47.50%      
Number of units | unit 468     468      
Marina Palms | Land              
Schedule of Equity Method Investments [Line Items]              
Total assets $ 201,800,000     $ 201,800,000 278,500,000    
Marine Palms, LLC, North Tower              
Schedule of Equity Method Investments [Line Items]              
Number of units for sale | unit 1     1      
Number of units | unit 234     234      
Marine Palms, LLC, South Tower              
Schedule of Equity Method Investments [Line Items]              
Number of units | unit 234     234      
Percentage of units pre-sold       83.00%      
Other real estate equity investments              
Schedule of Equity Method Investments [Line Items]              
Earnings (loss) from equity method investments       $ 11,600,000   32,900,000  
Other real estate equity investments | Minimum              
Schedule of Equity Method Investments [Line Items]              
iStar's ownership percentage 20.00%     20.00%      
Other real estate equity investments | Maximum              
Schedule of Equity Method Investments [Line Items]              
iStar's ownership percentage 85.00%     85.00%      
Other real estate equity investments | Land              
Schedule of Equity Method Investments [Line Items]              
Carrying value $ 49,600,000     $ 49,600,000 70,400,000    
Other real estate equity investments | Operating Properties              
Schedule of Equity Method Investments [Line Items]              
Carrying value $ 3,600,000     $ 3,600,000 $ 11,100,000    
Newly Formed Unconsolidated Entity              
Schedule of Equity Method Investments [Line Items]              
iStar's ownership percentage 50.00%     50.00%      
Income from sales of real estate       $ 8,800,000      
RCC | Operating Properties              
Schedule of Equity Method Investments [Line Items]              
iStar's ownership percentage 50.00%     50.00% 50.00%    
Contributions to other investments         $ 13,600,000    
Distributions from other investments       $ 17,600,000 21,000,000    
Sales price of real estate held for investment $ 36,000,000       68,500,000    
Proceeds from sale of other real estate, net of equity contribution 7,000,000       55,400,000    
Income from sales of real estate 8,800,000       13,600,000    
Loans commitment 27,000,000     27,000,000      
Payments for funding under loan commitments $ 23,000,000     23,000,000      
Equity Method Investee Two              
Schedule of Equity Method Investments [Line Items]              
Earnings (loss) from equity method investments       $ 11,600,000   $ 23,400,000  
Equity Method Investee Two | Land              
Schedule of Equity Method Investments [Line Items]              
iStar's ownership percentage 50.00%     50.00%   85.70%  
Carrying value $ 0     $ 0 6,300,000    
Loans commitment $ 45,700,000     45,700,000      
Interest and fee income       $ 3,600,000 3,900,000 $ 600,000  
Equity Method Investee Two | Land | Loans Receivable and Other Lending Investments, Net              
Schedule of Equity Method Investments [Line Items]              
Payments for funding under loan commitments         33,700,000    
Real Estate Equity Investment Four | Land              
Schedule of Equity Method Investments [Line Items]              
iStar's ownership percentage 20.10%     20.10%   15.70%  
Impairment       $ 3,600,000      
Carrying value $ 26,400,000     26,400,000 $ 24,000,000    
(Recovery of) provision for loan losses           $ 2,800,000  
Payments for investments       $ 1,900,000