Net Income Per Share of Common Stock (Tables)

6 Months Ended

Jun. 30, 2012

Net Income Per Share of Common Stock [Abstract]

Calculation of Numerator and Denominator in Earnings Per Share

	Six months ended June 30,				Three months ended June 30,
	2012		2011		2012		2011
	(unaudited)		(unaudited)		(unaudited)		(unaudited)
Numerator:
Net income	$	8,336	$	8,774	$	3,479	$	4,123
Denominator:
Weighted-average common stock outstanding		23,188		22,900		22,873		23,107
Effect of stock options		654		1,128		576		1,058
Diluted weighted average common stock outstanding		23,842		24,028		23,449		24,165
Basic net income per share	$	0.36	$	0.38	$	0.15	$	0.18
Diluted net income per share	$	0.35	$	0.37	$	0.15	$	0.17