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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Numerator for basic earnings per share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders | $ (18,984) | $ (34,530) | $ 50,698 | $ (7,978)
Income from discontinued operations | 0 | 0 | 0 | 4,939
Gain from discontinued operations | 0 | 0 | 0 | 123,418
Income tax expense from discontinued operations | 0 | 0 | 0 | (4,545)
Net income (loss) allocable to common shareholders | (18,984) | (34,530) | 50,698 | 115,834
Numerator for diluted earnings per share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders | (18,984) | (34,530) | 57,448 | (7,978)
Income from discontinued operations | 0 | 0 | 0 | 4,939
Gain from discontinued operations | 0 | 0 | 0 | 123,418
Income tax expense from discontinued operations | 0 | 0 | 0 | (4,545)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders | $ (18,984) | $ (34,530) | $ 57,448 | $ 115,834
Denominator for basic and diluted earnings per share: |  |  |  |
Weighted average common shares outstanding for basic earnings per common share (in shares) | 67,975 | 71,713 | 67,940 | 71,972
Add: Effect of assumed shares issued under treasury stock method for restricted stock units (in shares) | 0 | 0 | 131 | 0
Add: Effect of series J convertible perpetual preferred stock (in shares) | 0 | 0 | 15,658 | 0
Weighted average common shares outstanding for diluted earnings per common share (in shares) | 67,975 | 71,713 | 83,729 | 71,972
Basic earnings per common share: |  |  |  |
Income from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | $ (0.28) | $ (0.48) | $ 0.75 | $ (0.11)
Income from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.00 | 0.07
Gain from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.00 | 1.71
Income tax expense from discontinued operations (in dollars per share) | (0.00) | (0.00) | (0.00) | (0.06)
Net income attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | (0.28) | (0.48) | 0.75 | 1.61
Diluted earnings per common share: |  |  |  |
Income from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | (0.28) | (0.48) | 0.69 | (0.11)
Income from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.00 | 0.07
Gain from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.00 | 1.71
Income tax expense from discontinued operations (in dollars per share) | (0.00) | (0.00) | (0.00) | (0.06)
Net income attributable to iStar Inc. and allocable to common shareholders (in dollars per share) | $ (0.28) | $ (0.48) | $ 0.69 | $ 1.61

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) from discontinued operations available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1278-109256 + Details
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