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Weighted Average Common Shares (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted average shares used in computing earnings per common share:      
Weighted average common shares for basic earnings per share (in shares) 237,511 237,420 237,345
Effect of dilutive securities: restricted share awards (in shares) 35 32 37
Weighted average common shares for diluted earnings per share (in shares) 237,546 237,452 237,382