STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2013

The following costs related to the Company’s stock compensation plans are included in the unaudited consolidated statements of income:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of revenues	$	1,498	$	1,036	$	3,356	$	2,486
Selling, general and administrative expenses		1,867		1,010		6,435		2,883
Total	$	3,365	$	2,046	$	9,791	$	5,369

Stock option activity under the Company’s plans is set forth below:

	Number of Options			Weighted Average Exercise Price		Aggregate Intrinsic Value
Options outstanding at January 1, 2013		6,296,709		$	7.51	$	66,682
Options granted		1,931,500			23.19		21,845
Options exercised		(1,917,134	)		4.07		(58,338	)
Options forfeited/cancelled		(243,918	)		10.74		(5,795	)
Options outstanding at September 30, 2013		6,067,157		$	13.47	$	127,592
Options vested and exercisable at September 30, 2013		2,384,193		$	6.03	$	67,878
Options expected to vest		3,392,301		$	18.14	$	55,498

Summary of restricted stock activity as of September 30, 2013, and changes during the nine months then ended is presented below:

	Number of Shares			Weighted Average Grant Date Fair Value Per Share
Unvested restricted stock outstanding at January 1, 2013		659,872		$	17.92
Restricted stock granted		15,524			23.69
Restricted stock vested		(172,987	)		(16.71	)
Unvested restricted stock outstanding at September 30, 2013		502,409		$	18.51