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Net Income Per Common Share (Tables)
9 Months Ended
Sep. 30, 2021
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
 2021202020212020
 (thousands, except per-share data)
Net income$91,699 $103,192 $543,411 $148,978 
Weighted average common shares outstanding during the period (for basic calculation)39,442 39,315 39,413 39,264 
Dilutive effect of other potential common shares219 211 210 132 
Weighted average common shares and potential common shares (for diluted calculation)39,661 39,526 39,623 39,396 
Net income per common share - Basic$2.32 $2.62 $13.79 $3.79 
Net income per common share - Diluted$2.31 $2.61 $13.71 $3.78