STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Cost of revenues	$	2,525	$	1,079	$	3,928	$	1,858
Selling, general and administrative expenses	3,366		2,771		5,171		4,568
Total	$	5,891	$	3,850	$	9,099	$	6,426

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	2,346,500		32.26		26,961
Options exercised	(660,833	)	8.29		(23,433		)
Options forfeited/cancelled	(104,742	)	22.72		(2,203		)
Options outstanding at June 30, 2014	7,404,461		$	20.16	$	174,671

Options vested and exercisable at June 30, 2014	2,784,829		$	9.74	$	94,712
Options expected to vest	4,183,582		$	26.22	$	73,338

Summarized activity related to the Company’s service-based awards for the six months ended June 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	425,254		39.94
Awards vested	(67,357	)	17.62
Awards forfeited/cancelled	(16,924	)	20.81
Unvested service-based awards outstanding at June 30, 2014	685,901		$	31.94

Summarized activity related to the Company’s performance-based awards for the six months ended June 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 June 30, 2014	329,818		$	39.60