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Earnings Per Share
 12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Earnings Per Share
(15)    Earnings per Share ("EPS")
    The following table presents a reconciliation of the numerator and denominator of basic and diluted EPS:
Year Ended December 31,
202220212020
(Dollars in thousands, except per share amounts)
Numerator for basic and diluted EPS:
Net income$382,962 $388,330 $434,374 
Denominator:
Weighted average common shares outstanding for basic calculation258,781,843 266,251,097 267,916,483 
Add: Effect of equity awards9,385 66,097 14,161 
Weighted average common shares outstanding for diluted calculation258,791,228 266,317,194 267,930,644 
Basic EPS$1.48 $1.46 $1.62 
Diluted EPS$1.48 $1.46 $1.62 
    Basic EPS is calculated by dividing net income by the weighted average number of common shares outstanding, which included 243,006, 130,624 and 73,320 shares of participating securities in 2022, 2021 and 2020, respectively. Diluted EPS is calculated by dividing net income by the sum of the weighted average number of common shares outstanding plus the additional common shares that would have been outstanding if potentially dilutive securities had been issued.
    The weighted average common shares outstanding for the diluted earnings per share calculation excludes consideration of 2,240,655, 1,499,128 and 1,667,325 equivalent shares in 2022, 2021 and 2020, respectively, as these shares are anti-dilutive. See Note 14, "Stockholders' Equity" for details of the Company's common stock repurchases in 2022, 2021 and 2020.