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Per Common Share Amounts (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Per Common Share Amounts        
Weighted average common shares outstanding (basic) (in shares) 237,263 203,647 231,454 197,225
Effect of dilutive securities: unvested share awards 30 28 32 31
Weighted average common shares outstanding (diluted) (in shares) 237,293 203,675 231,486 197,256