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Net Income Per Common Share (Tables)
9 Months Ended
Sep. 30, 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
September 30
Nine Months Ended
September 30
 2022202120222021
 (thousands, except per-share data)
Net income$219,587 $91,699 $740,298 $543,411 
Weighted average common shares outstanding during the period (for basic calculation)39,544 39,442 39,521 39,413 
Dilutive effect of other potential common shares232 219 241 210 
Weighted average common shares and potential common shares (for diluted calculation)39,776 39,661 39,762 39,623 
Net income per common share - Basic$5.55 $2.32 $18.73 $13.79 
Net income per common share - Diluted$5.52 $2.31 $18.62 $13.71