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Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Income (loss) from continuing operations | $ (18,326) | $ 51,851 | $ 81,912
Net income attributable to noncontrolling interests | (13,936) | (4,526) | (4,876)
Preferred dividends | (32,495) | (48,444) | (51,320)
Premium above book value on redemption of preferred stock | 0 | (16,314) | 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 | (64,757) | (17,433) | 25,716
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 | (64,757) | (17,433) | 25,723
Income allocable to participating securities, basic |  |  | 8
Income allocable 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 | $ 0 | $ 7

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