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Net Income Per Common Share (Tables)
9 Months Ended
Sep. 30, 2020
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
 2020201920202019
 (thousands, except per-share data)
Net income$103,192 $27,171 $148,978 $66,278 
Weighted average common shares outstanding during the period (for basic calculation)39,315 39,087 39,264 39,020 
Dilutive effect of other potential common shares211 205 132 182 
Weighted average common shares and potential common shares (for diluted calculation)39,526 39,292 39,396 39,202 
Net income per common share - Basic$2.62 $0.70 $3.79 $1.70 
Net income per common share - Diluted$2.61 $0.69 $3.78 $1.69