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Earnings Per Common Share	9 Months Ended
Earnings Per Common Share	Sep. 30, 2020
Earnings Per Common Share [Abstract]
Earnings Per Common Share	7. EARNINGS PER COMMON SHARE Basic earnings per share are calculated by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that would occur if options granted under various share -based compensation plans were exercised resulting in the issuance of common shares that would participate in the earnings of the entity. Net income (loss) per common share has been computed as per below, based upon weighted average common basic and dilutive shares outstanding. Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands, except per share amounts) 2020 2019 2020 2019 Net income (loss) per share: Numerator Net income (loss) $ 243,057 $ 104,398 $ 450,549 $ 791,817 Less: dividends declared-common shares and unvested common shares (61,910) (56,995) (187,115) (171,131) Undistributed earnings 181,148 47,403 263,435 620,687 Percentage allocated to common shareholders (1) 98.8 % 98.9 % 98.7 % 98.9 % 178,938 46,869 260,096 613,847 Add: dividends declared-common shareholders 61,199 56,403 184,836 169,329 Numerator for basic and diluted earnings per common share $ 240,138 $ 103,273 $ 444,931 $ 783,176 Denominator Denominator for basic earnings per weighted-average common shares 39,483 40,287 39,711 40,289 Effect of dilutive securities: Options 74 125 79 131 Denominator for diluted earnings per adjusted weighted-average common shares 39,557 40,411 39,790 40,421 Per common share net income (loss) Basic $ 6.08 $ 2.56 $ 11.20 $ 19.44 Diluted $ 6.07 $ 2.56 $ 11.18 $ 19.38 (1) Basic weighted-average common shares outstanding 39,483 40,287 39,711 40,289 Basic weighted-average common shares outstanding and unvested common shares expected to vest 39,971 40,746 40,221 40,738 Percentage allocated to common shareholders 98.8 % 98.9 % 98.7 % 98.9 % (Some amounts may not reconcile due to rounding.) There were no anti-diluted options outstanding for the three and nine months ended September 30, 2020 and 2019. All outstanding options expire on or between February 24, 2021 and September 19, 2022 .