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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 | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders | $ (115,455) | $ (18,984) | $ 42,873 | $ 26,809 | $ (4,910) | $ (34,530) |  |  | $ (64,757) | $ (17,433) | $ 25,708
Income from discontinued operations |  |  |  |  |  |  |  |  | 0 | 4,939 | 18,264
Gain from discontinued operations |  |  |  |  |  |  |  |  | 0 | 123,418 | 0
Net income (loss) allocable to common shareholders |  |  |  |  |  |  | $ 177,467 | $ (27,102) | (64,757) | 110,924 | 43,972
Numerator for diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders | $ (115,455) | $ (18,984) | $ 45,123 | $ 29,059 |  |  |  |  | (64,757) | (17,433) | 25,715
Income from discontinued operations |  |  |  |  |  |  |  |  | 0 | 4,939 | 18,264
Gain from discontinued operations |  |  |  |  |  |  |  |  | 0 | 123,418 | 0
Net income (loss) attributable to iStar Inc. and allocable to common shareholders |  |  |  |  |  |  | $ 179,722 | $ (27,102) | $ (64,757) | $ 110,924 | $ 43,979
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares, Basic (in shares) | 68,012 | 67,975 | 67,932 | 67,913 | 68,200 | 71,713 | 72,142 | 72,065 | 67,958 | 71,021 | 73,453
Add: Effect of assumed shares issued under treasury stock method or restricted stock units (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 84
Add: Effect of joint venture shares (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 298
Weighted average common shares outstanding for diluted earnings per common share (in shares) | 68,012 | 67,975 | 83,694 | 83,670 | 68,200 | 71,713 | 88,195 | 72,065 | 67,958 | 71,021 | 73,835
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.95) | $ (0.25) | $ 0.35
Income from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | 0.07 | 0.25
Gain from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | 1.74 | 0.00
Earnings per share, basic (in dollars per share) | $ (1.70) | $ (0.28) | $ 0.63 | $ 0.39 | $ (0.07) | $ (0.48) | $ 2.46 | $ (0.38) | (0.95) | 1.56 | 0.60
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  | (0.95) | (0.25) | 0.35
Income from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | 0.07 | 0.25
Gain from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | 1.74 | 0.00
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | $ (1.70) | $ (0.28) | $ 0.54 | $ 0.35 | $ (0.07) | $ (0.48) | $ 2.04 | $ (0.38) | $ (0.95) | $ 1.56 | $ 0.60

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