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Earnings Per Share - (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reconciliation of number of shares used in calculation of basic and diluted earnings per share        
Weighted average number of common shares outstanding 79,497,482 80,340,076 80,272,613 80,368,589
Effect of non-participatory equity compensation (in shares) 25,845 40,000 25,845 40,000
Weighted average number of common shares outstanding, including effect of dilutive securities 79,523,327 80,380,076 80,298,458 80,408,589