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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]  
Weighted Average Fair Value Of Stock Options Granted
The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions: 
 
Year Ended December 31,
 
2011
 
2010
Risk-free interest rate
1.2%  - 2.6%

 
1.6% - 3.1%

Average expected life in years
6.25

 
6.25 - 7.0   

Expected volatility
54.4% - 56.1%

 
55.2% - 55.8%

Expected dividend yield
—
%
 
—
%
Summary Of Stock Options Activity
A summary of the Company’s stock options as of December 31, 2012, 2011 and 2010 , and changes during the years then ended is presented below: 
(In thousands, except per share amounts)
 
Year Ended December 31,
2012
 
2011
 
2010
 
 
Number
of Stock
Options
 
Weighted
Average
Exercise
Price
 
Number
of Stock
Options
 
Weighted
Average
Exercise
Price
 
Number
of Stock
Options
 
Weighted
Average
Exercise
Price
Outstanding, beginning of year
 
4,808

 
$
13.99

 
5,948

 
$
12.66

 
5,662

 
$
9.01

Granted, at fair market value
 
—

 
—

 
220

 
36.05

 
2,870

 
14.66

Exercised
 
(1,218
)
 
10.17

 
(1,126
)
 
11.42

 
(1,598
)
 
3.82

Expired
 
—

 
—

 
(26
)
 
9.47

 
(14
)
 
20.63

Forfeited
 
(441
)
 
15.19

 
(208
)
 
13.41

 
(972
)
 
11.76

Outstanding, end of year
 
3,149

 
$
15.31

 
4,808

 
$
13.99

 
5,948

 
$
12.66

Options exercisable, end of year
 
968

 
$
13.10

 
846

 
$
12.71

 
608

 
$
16.52
Stock Options Outstanding And Exercisable
The following table summarizes information about stock options outstanding and exercisable as of December 31, 2012:
(In thousands, except per share amounts)
Options Outstanding
 
Options Exercisable
Number of
Underlying
Shares
 
Weighted
Average
Exercise
Price Per
Share
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Total
Intrinsic
Value
 
Number of
Underlying
Shares
 
Weighted
Average
Exercise
Price Per
Share
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Total
Intrinsic
Value
3,149
 
$15.31
 
6.8
 
$104,618
 
968
 
$
13.10

 
5.7
 
$34,292
Summary Of Restricted Stock And Restricted Stock Units
A summary of the Company’s restricted stock and restricted stock units as of December 31, 2012, 2011 and 2010 , and changes during the years then ended is presented below: 
 
 
Year Ended December 31,
(In thousands, except per share amounts)
 
2012
 
2011
 
2010
 
 
Number
of
Restricted
Shares
 
Weighted
Average
Fair Value
 
Number
of
Restricted
Shares
 
Weighted
Average
Fair Value
 
Number
of
Restricted
Shares
 
Weighted
Average
Fair Value
Outstanding, beginning of year
 
1,646

 
$
29.11

 
824

 
$
18.02

 
976

 
$
18.70

Granted
 
1,329

 
45.84

 
1,576

 
33.10

 
390

 
16.73

Forfeited
 
(379
)
 
33.45

 
(454
)
 
29.76

 
(204
)
 
19.84

Vested
 
(339
)
 
23.31

 
(300
)
 
18.59

 
(338
)
 
17.41

Outstanding, end of year
 
2,257

 
$
39.02

 
1,646

 
$
29.11

 
824

 
$
18.02