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Weighted Average Common Shares (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted average shares used in computing earnings per common share:      
Weighted average common shares for basic earnings per share (in shares) 237,604 237,511 237,420
Effect of dilutive securities: restricted share awards (in shares) 0 35 32
Weighted average common shares for diluted earnings per share (in shares) 237,604 237,546 237,452
Antidilutive securities excluded from computation of earnings per share (in shares) 36