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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The RSU awards will vest ratably over three years. RSU activity for the year ended December 31, 2012 is as follows:

(in thousands, except weighted average fair value prices)
Number of Shares
 
Weighted Average Grant-Date Fair Value
Unvested RSUs outstanding at December 31, 2011
1,193

 
$
17.74

RSUs granted
781

 
$
17.36

RSUs vested
(516
)
 
$
17.95

RSUs forfeited
(77
)
 
$
16.78

Unvested RSUs outstanding at December 31, 2012
1,381

 
$
17.50
Schedule of Share-based Compensation, Performance Based Restricted Stock Units Award Activity
PBRSU activity for the year ended December 31, 2012 is as follows:

(in thousands, except weighted average fair value prices)
Number of Shares
 
Weighted Average Grant-Date Fair Value
Unvested PBRSUs outstanding at December 31, 2011
988

 
$
17.71

PBRSUs granted
348

 
$
16.12

PBRSUs vested
(103
)
 
$
17.76

PBRSUs forfeited
(81
)
 
$
17.95

Unvested PBRSUs outstanding at December 31, 2012
1,152

 
$
17.21
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair values of these stock options were estimated using a Black-Scholes model with the following weighted-average assumptions:
    
 
2012
 
2011
Expected dividend yield
0
%
 
0
%
Risk-free interest rate (1)
1.00
%
 
1.84
%
Expected volatility (2)
42.81
%
 
33.19
%
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 year ended December 31, 2012 is as follows:

(in thousands, except weighted average prices)
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
(744
)
 
$
18.99

 
 
 
 
Options canceled
(673
)
 
$
21.55

 
 
 
 
Options outstanding at December 31, 2012
3,765

 
$
20.18

 
5.4

 
$
25,422

Options vested and expected to vest at December 31, 2012
3,726

 
$
20.22

 
5.4

 
$
25,007

Options exercisable at December 31, 2012
2,242

 
$
22.33

 
3.6

 
$
10,337
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The following table sets forth the share-based compensation expense recognized, excluding discontinued operations, for the years ended December 31, 2012, 2011 and 2010.

(in thousands)
2012
 
2011
 
2010
Restricted stock units
$
9,988

 
$
7,141

 
$
9,979

Performance-based restricted stock units
7,050

 
1,779

 
2,098

Stock options
3,664

 
2,430

 
1,469

Employee stock purchase plan
107

 
299

 
423

 
$
20,809

 
$
11,649

 
$
13,969