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Net Income Per Common Share (Tables)
12 Months Ended
Dec. 31, 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:
 Year Ended December 31
 202020192018
 (thousands, except per-share data)
Net income$174,979 $80,925 $20,477 
Weighted average common shares outstanding during the period (for basic calculation)39,277 39,039 38,932 
Dilutive effect of other potential common shares154 203 455 
Weighted average common shares and potential common shares (for diluted calculation)39,431 39,242 39,387 
Net income per common share - Basic$4.45 $2.07 $0.53 
Net income per common share - Diluted$4.44 $2.06 $0.52