16. 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		Nine months ended
	September 30,		September 30,
	2017	2016	2017	2016
Weighted average shares used for the basic net income per share computation	275,511,870	258,085,633	270,584,365	253,953,149
Incremental shares from share-based compensation	221,779	271,259	224,727	270,152
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	276,050,671	258,673,914	271,126,114	254,540,323

Unvested shares from share-based compensation that were anti-dilutive	15,798	224	17,719	231

Weighted average partnership common units convertible to common shares that were anti-dilutive	88,182	97,312	88,182	235,446