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Net Income Per Common Share (Tables)
3 Months Ended
Mar. 31, 2022
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
 20222021
 (thousands, except per-share data)
Net income$302,600 $149,156 
Weighted average common shares outstanding during the period (for basic calculation)39,474 39,355 
Dilutive effect of other potential common shares294 275 
Weighted average common shares and potential common shares (for diluted calculation)39,768 39,630 
Net income per common share - Basic$7.67 $3.79 
Net income per common share - Diluted$7.61 $3.76