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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

RSU activity for the three months ended March 31, 2014 is as follows:



	Number of		Weighted-Average Grant-Date
(in thousands, except weighted-average fair value prices)	Shares		Fair Value
Unvested RSUs outstanding at December 31, 2013	1,466		$	22.13
RSUs granted	658		$	30.72
RSUs vested	(497	)	$	20.11
RSUs forfeited	(29	)	$	22.45
Unvested RSUs outstanding at March 31, 2014	1,598		$	26.28

Schedule of Other Share-Based Compensation, Valuation Assumptions [Table Text Block]

The fair values of the 2014 and 2013 awards were estimated using Monte-Carlo simulation with the following weighted-average assumptions.



	For the Three Months Ended March 31,
	2014		2013

Expected dividend yield	—	%	—	%
Risk-free interest rate ⁽¹⁾	0.70	%	0.35	%
Expected volatility ⁽²⁾	27.87	%	30.59	%
Average total shareholder return ⁽²⁾	(0.84	)%	8.21	%


(1)	The risk-free interest rate for the periods within the contractual term of the options is based on the U.S. Treasury yield curve in effect at the time of the grant.


(2)	The expected volatility and average total shareholder return is a measure of the amount by which a stock price has fluctuated or is expected to fluctuate based primarily on our and our peers' historical data.

Schedule of Other Share-based Compensation, Activity

PBRSU activity for the three months ended March 31, 2014, is as follows:



	Number of		Weighted-Average Grant-Date
(in thousands, except weighted-average fair value prices)	Shares		Fair Value
Unvested PBRSUs outstanding at December 31, 2013	1,247		$	18.52
PBRSUs granted	330		$	31.57
PBRSUs vested	(612	)	$	16.92
PBRSUs forfeited	(11	)	$	19.81
Unvested PBRSUs outstanding at March 31, 2014	954		$	22.02

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair values of these stock options were estimated using the Black-Scholes valuation model with the following weighted-average assumptions:



	For the Three Months Ended
	March 31,
	2014		2013
Expected dividend yield	—	%	—	%
Risk-free interest rate ⁽¹⁾	1.74	%	0.90	%
Expected volatility ⁽²⁾	37.92	%	41.65	%
Expected life ⁽³⁾	5.5		5.50


(1)	The risk-free interest rate for the periods within the contractual term of the options is based on the U.S. Treasury yield curve in effect at the time of the grant.


(2)	The expected volatility is a measure of the amount by which a stock price has fluctuated or is expected to fluctuate based primarily on our and our peers' historical data.


(3)	The expected life is the period of time, on average, that participants are expected to hold their options before exercise based primarily on our historical data.

Schedule of Share-based Compensation, Stock Options, Activity

Option activity for the three months ended March 31, 2014 is as follows:



(in thousands, except weighted-average price)	Number of Shares		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Options outstanding at December 31, 2013	2,663		$	21.12
Options granted	243		$	31.59
Options exercised	(70	)	$	17.50
Options canceled	(16	)	$	20.66
Options outstanding at March 31, 2014	2,820		$	22.11	5.5	$	22,775
Options vested and expected to vest at March 31, 2014	2,771		$	22.02	5.4	$	22,600
Options exercisable at March 31, 2014	1,914		$	21.37	4.2	$	16,590

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table sets forth the stock-based compensation expense recognized for the three months ended March 31, 2014 and 2013.



	For the Three Months Ended
	March 31,
(in thousands)	2014		2013
RSUs	$	5,473	$	5,100
PBRSUs	1,243		2,155
Stock options	1,105		683
Employee stock purchase plan	265		204
	$	8,086	$	8,142

The above share-based compensation expense includes $0.3 million and $0.1 million within cost of services in the accompanying condensed consolidated statements of operations for the three months ended March 31, 2014 and 2013, respectively. It also includes $0.1 million and less than $0.1 million of share-based compensation expense for the three months ended March 31, 2014 and 2013, respectively, reported within income from discontinued operations in the accompanying condensed consolidated statements of operations.