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Earnings Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reconciliation of number of shares used in calculation of basic and diluted earnings per share        
Weighted average number of common shares outstanding 85,900,000 85,200,000 85,900,000 86,200,000
Effect of non-participatory equity compensation (in shares) 45,000 36,000 45,000 36,000
Weighted average number of common shares outstanding, including effect of dilutive securities 86,000,000 85,200,000 85,900,000 86,300,000