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Earnings Per Share (Earnings Allocable to Common Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Denominator for basic and diluted earnings per share: |  |
Weighted average common shares outstanding for basic and diluted earnings per common share | 72,065 | 77,060
Basic and diluted earnings per common share: |  |
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | $ (0.38) | $ (0.27)
Common Stock |  |
Denominator for basic and diluted earnings per share: |  |
Weighted average common shares outstanding for basic and diluted earnings per common share | 72,065 | 77,060
Basic and diluted earnings per common share: |  |
Income (loss) from operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | $ (0.38) | $ (0.27)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | $ (0.38) | $ (0.27)
Basic and Diluted | Common Stock |  |
Numerator for basic earnings per share: |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders | $ (27,102) | $ (21,187)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders | $ (27,102) | $ (21,187)

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