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Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Income (loss) from continuing operations | $ 334,325 | $ (18,326) | $ 51,851
Net income attributable to noncontrolling interests | (10,283) | (13,936) | (4,526)
Preferred dividends | (32,495) | (32,495) | (48,444)
Premium above book value on redemption of preferred stock | 0 | 0 | (16,314)
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders for basic earnings per common share | 291,547 | (64,757) | (17,433)
Add: Effect of Series J convertible perpetual preferred stock | 9,000 | 0 | 0
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders for diluted earnings per common share | $ 300,547 | $ (64,757) | $ (17,433)

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