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Earnings Per Share (Earnings Allocable to Common Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Numerator for basic and diluted earnings per share: |  |  |  |
Net loss attributable to iStar Inc. and allocable to common shareholders - Basic | $ (19,543) | $ (23,335) | $ (19,948) | $ (44,786)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders - Diluted | $ (19,543) | $ (23,335) | $ (19,948) | $ (44,786)
Denominator for basic and diluted earnings per share: |  |  |  |
Weighted average common shares outstanding for basic and diluted earnings per common share | 72,872,000 | 76,232,000 | 73,374,000 | 76,838,000
Basic and diluted earnings per common share: |  |  |  |
Net loss allocable to common shareholders - Basic and diluted | $ (0.27) | $ (0.31) | $ (0.27) | $ (0.58)
3.125% Senior Convertible Notes |  |  |  |
Basic and diluted earnings per common share: |  |  |  |
Antidilutive (in shares) | 4,700,805 | 0 | 3,797,296 | 0
Stated interest rates | 3.125% | 3.125% | 3.125% | 3.125%

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