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Earnings per Share (EPS)
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Earnings per Share (EPS) Earnings per Share (EPS)
 
The following table reconciles the net income and the weighted average common shares outstanding used in the computations of basic and diluted earnings per common share:
 
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In thousands, except per share amounts)2023202220232022
Net income$177,959 $178,051 $521,019 $683,987 
Basic weighted average shares outstanding105,979 106,870 106,387 107,314 
Dilutive effect of nonvested shares1,046 467 845 418 
Diluted weighted average shares outstanding107,025 107,337 107,232 107,732 
Basic earnings per share$1.68 $1.67 $4.90 $6.37 
Diluted earnings per share$1.66 $1.66 $4.86 $6.35 
 
There were 65,435 and 10,417 antidilutive shares for the three months ended September 30, 2023 and 2022, respectively, and 64,108 and 90,413 antidilutive shares for the nine months ended September 30, 2023 and 2022, respectively.
 
Nonvested performance-based share awards are considered contingently issuable for purposes of the EPS calculation. The 2023, 2022 and 2021 performance-based share awards vest based upon our compounded annual book value per share growth percentage and relative total shareholder return during a three-year performance period. The performance-based share awards granted in years before 2021 vest based upon our compounded annual book value per share growth percentage during a three-year performance period. The following table summarizes the performance-based shares issuable if the reporting date was the end of the contingency period.

2023 Performance-Based Grants2022 Performance-Based Grants2021 Performance-Based Grants2020 Performance-Based Grants
Reporting DatePercent Issuable Relative to TargetAs a Percent of Shares IssuedPercent Issuable Relative to TargetAs a Percent of Shares IssuedPercent Issuable Relative to TargetAs a Percent of Shares IssuedPercent Issuable Relative to Target
and Shares Issued
September 30, 2023
200%100%200%100%157%78.5%
September 30, 2022
146%73%100%50%100%