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Weighted Average Common Shares (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted Average Common Shares      
Weighted average common shares outstanding (basic) (in shares) 232,931 198,868 187,271
Effect of dilutive securities: unvested share awards 32 26 143
Weighted average common shares outstanding (diluted) (in shares) 232,963 198,894 187,414