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Net Income Per Common Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Income Per Common Share        
Weighted average shares used for the basic net income per share computation 253,375,546 232,403,586 251,792,989 228,932,782
Incremental shares from share-based compensation 281,177 165,577 280,696 128,980
Weighted average shares used for diluted net income per share computation 253,973,745 232,886,185 252,390,707 229,378,784
Unvested Shares        
Net Income Per Common Share        
Unvested shares from share-based compensation that were anti-dilutive   115,789 1,978 107,539
Convertible Partnership Units        
Net Income Per Common Share        
Weighted average partnership common units convertible to common shares that were dilutive 317,022 317,022 317,022 317,022
Unvested shares from share-based compensation that were anti-dilutive 280,498 419,546 305,272 429,988