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Earnings Per Share - Earnings Allocable to Common Shares (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) trading_day $ / shares shares
Numerator for basic earnings per share: |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to common shareholders | $ | $ (23,335) | $ 362,715 | $ (44,786) | $ 345,150
Numerator for diluted earnings per share: |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to common shareholders | $ | $ (23,335) | $ 364,965 | $ (44,786) | $ 349,650
Denominator for basic and diluted earnings per share: |  |  |  |
Weighted average common shares outstanding for basic earnings per common share (in shares) | 76,232 | 64,019 | 76,838 | 65,873
Add: Effect of assumed shares issued under treasury stock method for restricted stock units (in shares) | 0 | 87 | 0 | 85
Add: Effect of series J convertible perpetual preferred stock (in shares) | 0 | 16,153 | 0 | 16,053
Weighted average common shares outstanding for diluted earnings per common share (in shares) | 76,232 | 80,259 | 76,838 | 82,011
Basic earnings per common share: |  |  |  |
Net income (loss) allocable to common shareholders (in dollars per share) | $ / shares | $ (0.31) | $ 5.67 | $ (0.58) | $ 5.24
Diluted earnings per common share: |  |  |  |
Net income (loss) allocable to common shareholders (in dollars per share) | $ / shares | $ (0.31) | $ 4.55 | $ (0.58) | $ 4.26
3.125% Senior Convertible Notes |  |  |  |
Diluted earnings per common share: |  |  |  |
Stated interest rates (as a percent) | 3.125% | 3.125% | 3.125% | 3.125%
Threshold consecutive trading days | trading_day |  |  |  | 40

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