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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
RSU activity for the six months ended June 30, 2012, 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, 2011
1,193

 
$
17.74

RSUs granted
718

 
$
16.58

RSUs vested
(409
)
 
$
18.21

RSUs forfeited
(40
)
 
$
16.46

Unvested RSUs outstanding at June 30, 2012
1,462

 
$
17.07
Schedule of Other Share-based Compensation, Activity

PBRSU activity for the six months ended June 30, 2012, 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, 2011
988

 
$
17.71

PBRSUs granted
345

 
$
16.05

PBRSUs vested
(103
)
 
$
17.76

PBRSUs forfeited
(41
)
 
$
17.92

Unvested PBRSUs outstanding at June 30, 2012
1,189

 
$
17.22
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
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
 
June 30,
 
2012
 
2011
Expected dividend yield
—
%
 
—
%
Risk-free interest rate (1)
1.00
%
 
2.01
%
Expected volatility (2)
42.81
%
 
32.02
%
Expected life (3)
5.5

 
5.5


(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 six months ended June 30, 2012 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, 2011
4,601

 
$
20.78

 
 
 
 
Options granted
581

 
$
16.00

 
 
 
 
Options exercised
(76
)
 
$
13.82

 
 
 
 
Options canceled
(590
)
 
$
21.63

 
 
 
 
Options outstanding at June 30, 2012
4,516

 
$
20.11

 
5.6

 
$
3,922

Options vested and expected to vest at June 30, 2012
4,457

 
$
20.16

 
5.5

 
$
3,801

Options exercisable at June 30, 2012
2,912

 
$
21.88

 
3.8

 
$
1,418
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 June 30, 2012 and 2011.
 
 
For the Three Months Ended
 
For the Six Months Ended
 
June 30,
 
June 30,
(in thousands)
2012
 
2011
 
2012
 
2011
RSUs
$
2,575

 
$
1,999

 
4,788

 
3,741

PBRSUs
1,164

 
319

 
2,524

 
904

Stock options
938

 
434

 
1,719

 
1,141

Employee stock purchase plan
—

 
116

 
—

 
192

 
$
4,677

 
$
2,868

 
$
9,031

 
$
5,978