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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders | $ (34,530) | $ 42,571 | $ (7,978) | $ 52,280
Income from discontinued operations | 0 | 3,721 | 4,939 | 10,929
Gain from discontinued operations | 0 | 0 | 123,418 | 0
Income tax expense from discontinued operations | 0 | 0 | (4,545) | 0
Net income (loss) allocable to common shareholders | (34,530) | 46,292 | 115,834 | 63,209
Numerator for diluted earnings per share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders | (34,530) | 47,732 | (7,978) | 67,786
Income from discontinued operations | 0 | 3,721 | 4,939 | 10,931
Gain from discontinued operations | 0 | 0 | 123,418 | 0
Income tax expense from discontinued operations | 0 | 0 | (4,545) | 0
Net income (loss) attributable to iStar Inc. and allocable to common shareholders | $ (34,530) | $ 51,453 | $ 115,834 | $ 78,717
Denominator for basic and diluted earnings per share: |  |  |  |
Weighted average common shares outstanding for basic earnings per common share | 71,713 | 71,210 | 71,972 | 74,074
Add: Effect of assumed shares issued under treasury stock method for restricted stock units | 0 | 87 | 0 | 65
Add: Effect of joint venture shares | 0 | 298 | 0 | 298
Weighted average common shares outstanding for diluted earnings per common share | 71,713 | 115,666 | 71,972 | 118,590
Basic earnings per common share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | $ (0.48) | $ 0.60 | $ (0.11) | $ 0.70
Income (loss) from discontinued operations (in dollars per share) | 0.00 | 0.05 | 0.07 | 0.15
Gain from discontinued operations (in dollars per share) | 0.00 | 0.00 | 1.71 | 0.00
Income tax expense from discontinued operations (in dollars per share) | (0.00) | (0.00) | (0.06) | (0.00)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | (0.48) | 0.65 | 1.61 | 0.85
Diluted earnings per common share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | (0.48) | 0.41 | (0.11) | 0.57
Income from discontinued operations (in dollars per share) | 0.00 | 0.03 | 0.07 | 0.09
Gain from discontinued operations (in dollars per share) | 0.00 | 0.00 | 1.71 | 0.00
Income tax expense from discontinued operations (in dollars per share) | (0.00) | (0.00) | (0.06) | (0.00)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | $ (0.48) | $ 0.44 | $ 1.61 | $ 0.66
Add: Effect of 1.50% senior convertible unsecured notes |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |
Add: Effect of senior convertible unsecured notes | 0 | 11,444 | 0 | 11,526
Add: Effect of 3.00% senior convertible unsecured notes |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |
Add: Effect of senior convertible unsecured notes | 0 | 16,992 | 0 | 16,992
Preferred Stock Series J |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |
Add: Effect of series J convertible perpetual preferred stock | 0 | 15,635 | 0 | 15,635

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