Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Net Income Per Share [Abstract]

Schedule of earnings per share, basic and diluted

	Three Months Ended March 31,
	2013			2012
Numerator:
Net income, as reported	$	8,616		$	5,720
Less: net income attributable to participating securities		(138	)		(87	)
Net income available to common shareholders—basic	$	8,478		$	5,633
Denominator:
Basic:
Weighted-average shares of common stock outstanding		37,717,140			36,839,767
Less: weighted-average shares of unvested restricted common stock outstanding		(614,633	)		(557,339	)
Weighted-average number of common shares used in computing basic net income per common share		37,102,507			36,282,428
Net income per share applicable to common shareholders—basic	$	0.23		$	0.16

	Three Months Ended March 31,
	2013			2012
Numerator:
Net income available to common shareholders—basic	$	8,478		$	5,633
Add-back: undistributed earnings allocated to unvested shareholders		103			87
Less: undistributed earnings reallocated to unvested shareholders		(100	)		(84	)
Net income available to common shareholders—diluted	$	8,481		$	5,636
Denominator:
Diluted:
Weighted-average shares of common stock outstanding		37,717,140			36,839,767
Less: weighted-average shares of unvested restricted common stock outstanding		(614,633	)		(557,339	)
Weighted-average number of common shares issuable upon exercise of outstanding stock options, based on the treasury stock method		1,382,015			1,324,619
Weighted-average number of common shares used in computing diluted net income per common share		38,484,522			37,607,047
Net income per share applicable to common shareholders—diluted	$	0.22		$	0.15

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

	Three Months Ended March 31,
	2013		2012
Options		190,861		1,575,517
Unvested restricted stock		67,414		2,063