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Net Income Per Common Share (Tables)
3 Months Ended
Mar. 31, 2023
Earnings Per Share [Abstract]  
Net Income Per Common Share [Table Text Block]
The following table sets forth the computation of basic and diluted net income per common share:
 Three Months Ended
March 31
 20232022
 (thousands, except per-share data)
Net income$96,733 $302,600 
Weighted average common shares outstanding during the period (for basic calculation)39,593 39,474 
Dilutive effect of other potential common shares245 294 
Weighted average common shares and potential common shares (for diluted calculation)39,838 39,768 
Net income per common share - Basic$2.44 $7.67 
Net income per common share - Diluted$2.43 $7.61