Net Income Per Common Share

3 Months Ended

Mar. 31, 2012

Net Income Per Common Share [Abstract]

Net Income Per Common Share

14.   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 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  March 31,
	2012		2011
Weighted average shares used for the basic net income per share computation		132,577,100		118,960,878
Incremental shares from share-based compensation		126,854		148,166
Adjusted weighted average shares used for diluted net income per share computation		132,703,954		119,109,044
Unvested shares from share-based compensation that were anti-dilutive		200		800