STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2014

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



	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Cost of revenues	$	2,463	$	1,498	$	6,391	$	3,356
Selling, general and administrative expenses	4,962		1,867		10,133		6,435
Total	$	7,425	$	3,365	$	16,524	$	9,791

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, 2014	5,823,536		$	13.99	$	122,003
Options granted	2,373,500		32.33		27,200
Options exercised	(828,756	)	8.54		(29,214		)
Options forfeited/cancelled	(162,829	)	24.41		(3,156		)
Options outstanding at September 30, 2014	7,205,451		$	20.42	$	168,391

Options vested and exercisable at September 30, 2014	2,708,228		$	9.87	$	91,863
Options expected to vest	4,101,056		$	26.58	$	70,579

Summarized activity related to the Company’s service-based awards for the nine months ended September 30, 2014, was as follows:



	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Unvested service-based awards outstanding at January 1, 2014	344,928		$	18.74
Awards granted	432,356		39.93
Awards vested	(67,357	)	(17.62		)
Awards forfeited/cancelled	(16,924	)	20.81
Unvested service-based awards outstanding at September 30, 2014	693,003		$	32.02

Summarized activity related to the Company’s performance-based awards for the nine months ended September 30, 2014, was as follows:



	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Unvested performance-based awards outstanding at January 1, 2014	—		$	—
Awards granted	376,966		38.55
Awards vested	—		—
Awards forfeited/cancelled	(817	)	36.57
Changes in the number of awards expected to be delivered	(46,331	)	31.13
Unvested performance-based awards outstanding at September 30, 2014	329,818		$	39.60