Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Net Income Per Share [Abstract]

Schedule of earnings per share, basic and diluted

The following presents a reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share (in thousands, except share and per share data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Numerator:
Net income, as reported	$	7,990		$	5,992		$	21,125		$	17,030
Less: net income attributable to participating securities		(133	)		(101	)		(346	)		(277	)
Net income available to common shareholders—basic and diluted	$	7,857		$	5,891		$	20,779		$	16,753
Denominator:
Basic:
Weighted-average shares of common stock outstanding		36,936,791			36,053,462			36,822,423			35,852,081
Less: weighted-average shares of unvested restricted common stock outstanding		(613,235	)		(605,978	)		(604,473	)		(584,489	)
Weighted-average number of common shares used in computing basic net income per common share		36,323,556			35,447,484			36,217,950			35,267,592
Net income per share applicable to common shareholders—basic	$	0.22		$	0.17		$	0.57		$	0.48

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Diluted:
Weighted-average shares of common stock outstanding		36,936,791			36,053,462			36,822,423			35,852,081
Less: weighted-average shares of unvested restricted common stock outstanding		(613,235	)		(605,978	)		(604,473	)		(584,489	)
Weighted-average number of common shares issuable upon exercise of outstanding stock options, based on the treasury stock method		1,169,883			1,262,393			1,252,747			1,317,987
Weighted-average number of restricted stock outstanding, based on the treasury stock method		126,830			119,641			129,751			117,719
Weighted-average number of common shares used in computing diluted net income per common share		37,620,269			36,829,518			37,600,448			36,703,298
Net income per share applicable to common shareholders—diluted	$	0.21		$	0.16		$	0.55		$	0.46

Schedule of anti-dilutive securities excluded from computation of earnings per share

The following common share equivalents have been excluded from the computation of diluted weighted-average shares outstanding, as their effect would have been anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Options		1,937,631		1,765,782		1,818,198		1,486,671
Unvested restricted stock		0		7,468		1,861		16,171