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Net Income per Common Share
 9 Months Ended
Sep. 30, 2018
Earnings Per Share Reconciliation [Abstract]  
Net Income per Common Share Net Income per Common Share
 
Basic net income per common share is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during each period. Diluted net income per common share is computed by dividing net income available to common stockholders, plus income attributable to dilutive shares and convertible common units, for the period by the weighted average number of common shares that would have been outstanding assuming the issuance of common shares for all potentially dilutive common shares outstanding during the reporting period.

The following is a reconciliation of the denominator of the basic net income per common share computation to the denominator of the diluted net income per common share computation.
Three months ended September 30, Nine months ended September 30, 
2018201720182017
Weighted average shares used for the basic net income per share computation
290,664,368 275,511,870 286,599,191 270,584,365 
Incremental shares from share-based compensation
225,796 221,779 189,072 224,727 
Weighted average partnership common units convertible to common shares that were dilutive
317,022 317,022 317,022 317,022 
Weighted average shares used for diluted net income per share computation
291,207,186 276,050,671 287,105,285 271,126,114 
Unvested shares from share-based compensation that were anti-dilutive
261 15,798 1,378 17,719 
Weighted average partnership common units convertible to common shares that were anti-dilutive
397,690 88,182 271,890 88,182