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Earnings Per Common Share Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Common Share    
Net earnings $ 49,292 $ 7,323
Weighted-average shares outstanding 54,774 53,930
Effect of dilutive stock awards 1,378 1,566
Weighted-average dilutive shares 56,152 55,496
Basic earnings per common share $ 0.90 $ 0.14
Diluted earnings per common share $ 0.88 $ 0.13
Retained Earnings [Member]    
Earnings Per Common Share    
Net earnings   $ 7,323
Restricted share units [Member]    
Earnings Per Common Share    
Anti-dilutive securities 148 0
Performance-based restricted stock units [Member]    
Earnings Per Common Share    
Anti-dilutive securities 519 0
Stock options [Member]    
Earnings Per Common Share    
Anti-dilutive securities 1,357 1,019