STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2015

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



	Three Months Ended March 31,
	2015		2014
Cost of revenues	$	2,484	$	1,403
Selling, general and administrative expenses - Acquisition related	4,492		793
Selling, general and administrative expenses - All other	2,158		1,012
Total	$	9,134	$	3,208

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, 2015	6,838,746		$	20.98	$	183,073
Options granted	2,069,300		61.38		(186		)
Options exercised	(346,499	)	12.84		(16,788		)
Options forfeited/cancelled	(33,922	)	28.22		(1,122		)
Options outstanding at March 31, 2015	8,527,625		$	31.09	$	257,534

Options vested and exercisable at March 31, 2015	3,329,962		$	15.56	$	152,279
Options expected to vest	4,741,728		$	40.53	$	98,438

Summarized activity related to the Company’s service-based awards for the three months ended March 31, 2015, was as follows:



	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Unvested service-based awards outstanding at January 1, 2015	633,442		$	36.88
Awards granted	48,000		61.38
Awards vested	(21,442	)	28.68
Awards forfeited/cancelled	—		—
Unvested service-based awards outstanding at March 31, 2015	660,000		$	38.93

Summarized activity related to the Company’s performance-based awards for the three months ended March 31, 2015, was as follows:



	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Unvested performance-based awards outstanding at January 1, 2015	371,510		$	39.34
Awards granted	—		—
Awards vested	(8,501	)	36.57
Awards forfeited/cancelled	—		—
Changes in the number of awards expected to be delivered	(20,583	)	56.74
Unvested performance-based awards outstanding at March 31, 2015	342,426		$	37.91