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Earnings Per Common Share - Narrative (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares included in computation of diluted earnings per share 4,000 4,000 5,000
Restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares included in computation of diluted earnings per share 89 89  
Employee stock option      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (in shares) 454 471 694