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Net Income Per Common Share (Tables)
9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Net Income Per Common Share
The following table sets forth the computation of basic and diluted net income per common share:
 Three Months Ended
September 30
Nine Months Ended
September 30
 2023202220232022
 (thousands, except per-share data)
Net income$143,068 $219,587 $386,121 $740,298 
Weighted average common shares outstanding during the period (for basic calculation)39,675 39,544 39,648 39,521 
Dilutive effect of other potential common shares308 232 201 241 
Weighted average common shares and potential common shares (for diluted calculation)39,983 39,776 39,849 39,762 
Net income per common share - Basic$3.61 $5.55 $9.74 $18.73 
Net income per common share - Diluted$3.58 $5.52 $9.69 $18.62