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Net Income Per Common Share (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net Income Per Common Share        
Weighted average shares used for the basic net income per share computation 236,211,706 222,061,661 231,434,521 216,804,815
Incremental shares from share-based compensation 211,214 174,410 111,224 25,198
Weighted average shares used for diluted net income per share computation 236,739,942 222,236,071 231,862,767 217,147,035
Unvested Shares        
Net Income Per Common Share        
Unvested shares from share-based compensation that were anti-dilutive 132,948 45,654 107,879 58,654
Convertible Partnership Units        
Net Income Per Common Share        
Weighted average partnership common units convertible to common shares that were dilutive 317,022   317,022 317,022
Unvested shares from share-based compensation that were anti-dilutive 419,546 841,568 426,469 529,381