Net Income Per Common Share (Tables)

3 Months Ended

Mar. 31, 2012

Net Income Per Common Share [Abstract]

Net income per common share

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