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Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Income (loss) from continuing operations $ (40,198) $ (23,384) $ (115,050)
Income from sales of real estate 92,049 105,296 93,816
Net (income) loss attributable to noncontrolling interests (4,526) (4,876) 3,722
Preferred dividends (48,444) (51,320) (51,320)
Premium above book value on redemption of preferred stock (16,314) 0 0
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders, HPU holders and Participating Security Holders for basic earnings per common share (17,433) 25,716 (68,832)
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders, HPU holders and Participating Security Holders for diluted earnings per common share (17,433) 25,723 (68,832)
Undistributed earnings (loss) allocated to participating securities, basic   8  
Undistributed earnings (loss) allocated to participating securities, diluted   8  
Joint venture shares      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Dilutive securities, effect on basic earnings per share, dilutive convertible securities $ 0 $ 7 $ 0