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Earnings Per Common Share Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Common Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Summarized basic and diluted earnings per common share were calculated as follows: 
 Year Ended December 31,
 (In thousands, except per share data)202020192018
Numerator:
Net earnings$208,115 $173,546 $8,492 
Denominator:
Weighted-average shares outstanding54,187 54,325 53,471 
Effect of dilutive stock awards1,567 1,630 1,071 
Weighted-average dilutive shares55,754 55,955 54,542 
Basic earnings per share$3.84 $3.19 $0.16 
Diluted earnings per share$3.73 $3.10 $0.16 
Anti-dilutive securities excluded from diluted earnings per common share:
Anti-dilutive restricted share units— — 
Anti-dilutive performance share units290 200 
Anti-dilutive stock options949 1,109 1,498