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Net Income Per Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Summary of Table Reconciling Basic and Diluted Net Income Per Share
The following table reconciles basic and diluted net income per share:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(dollars and shares in thousands, except per share data)2021202020212020
Basic Net Income Per Share    
Net income$71,746 $77,944 $221,350 $152,289 
Weighted average common shares outstanding165,258 164,773 165,144 165,748 
Basic Net Income Per Share$0.43 $0.47 $1.34 $0.92 
Diluted Net Income Per Share
Net income$71,746 $77,944 $221,350 $152,289 
Weighted average common shares outstanding165,258 164,773 165,144 165,748 
Effect of dilutive securities:
Restricted stock660 611 696 586 
Stock options and appreciation rights21 35 22 36 
Weighted average shares outstanding165,939 165,419 165,862 166,370 
Diluted Net Income Per Share$0.43 $0.47 $1.33 $0.92