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Net Income Per Common Share (Tables)
3 Months Ended
Mar. 31, 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
March 31
 20212020
 (thousands, except per-share data)
Net income$149,156 $12,200 
Weighted average common shares outstanding during the period (for basic calculation)39,355 39,163 
Dilutive effect of other potential common shares275 242 
Weighted average common shares and potential common shares (for diluted calculation)39,630 39,405 
Net income per common share - Basic$3.79 $0.31 
Net income per common share - Diluted$3.76 $0.31