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Net Income Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2024
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
 2024202320242023
 (thousands, except per-share data)
Net income$91,038 $143,068 $307,454 $386,121 
Weighted average common shares outstanding during the period (for basic calculation)38,848 39,675 39,286 39,648 
Dilutive effect of other potential common shares215 308 235 201 
Weighted average common shares and potential common shares (for diluted calculation)39,063 39,983 39,521 39,849 
Net income per common share - Basic$2.34 $3.61 $7.83 $9.74 
Net income per common share - Diluted$2.33 $3.58 $7.78 $9.69