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Stock-Based Compensation and Other Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Summary Of Restricted Share Award Activity
Following is a summary of restricted share award activity during the years indicated:
 
Restricted
Shares
 
Weighted Average  
Grant Date
Fair Value
Non-vested restricted shares, as of December 31, 2010
1,009,777

 
$
9.32

Granted
364,784

 
17.06

Vested
(646,531
)
 
8.00

Canceled/forfeited
(11,250
)
 
9.80

Non-vested restricted shares, as of December 31, 2011
716,780

 
$
14.45

Granted
397,623

 
21.22

Vested
(347,889
)
 
12.68

Canceled/forfeited
(11,500
)
 
15.02

Non-vested restricted shares, as of December 31, 2012
755,014

 
$
18.82
Summary of Stock Option Activity
The following is a summary of stock option activity during the years indicated:
 
Stock 
Options
 
Weighted Average 
Exercise Price
 
Weighted Average
Remaining
Contractual Life (years)
 
Aggregate Intrinsic
Value (1)  
(in millions)
Options outstanding as of December 31, 2010
2,588,170

 
$
10.27

 
3.87
 
$
11.2

Exercised
(1,132,396
)
 
10.25

 
 
 
 
Canceled/forfeited
(10,000
)
 
13.95

 
 
 
 
Options outstanding as of December 31, 2011
1,445,774

 
$
10.25

 
3.16
 
$
10.3

Options exercisable as of December 31, 2011
1,445,774

 
$
10.25

 
3.16
 
$
10.3

 
 
 
 
 
 
 
 
Options outstanding as of December 31, 2011
1,445,774

 
$
10.25

 
3.16
 
$
10.3

Exercised
(391,949
)
 
9.46

 
 
 
 
Canceled/forfeited
—

 
—

 
 
 
 
Options outstanding as of December 31, 2012
1,053,825

 
$
10.55

 
2.31
 
$
15.2

Options exercisable as of December 31, 2012
1,053,825

 
$
10.55

 
2.31
 
$
15.2

(1) 
Amount represents the difference between the exercise price and the market price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.
Summary Of Stock-Based Compensation Expense And Related Tax Benefits
Details of stock based compensation expense and related tax benefits for the periods indicated are as follows (in millions):
 
Years Ended December 31,
 
2012
 
2011
 
2010
Stock based compensation expense:
 
 
 
 
 
Restricted share awards
$
4.4

 
$
3.6

 
$
3.8

Stock options
—

 
—

 
0.1

Total stock based compensation expense
$
4.4

 
$
3.6

 
$
3.9

Income tax benefit from stock based compensation:
 
 
 
 
 
   Restricted share awards
$
1.8

 
$
3.4

 
$
1.3

Stock options
0.7

 
2.9

 
(0.3
)
Total income tax benefit from stock based compensation
$
2.5

 
$
6.3

 
$
1.0

Excess tax benefit from stock based compensation:
 
 
 
 
 
   Vested restricted shares (1)    
$
0.1

 
$
2.1

 
$
—

Stock options exercised (1)
0.7

 
5.7

 
—

Total excess tax benefit from stock based compensation (1)
$
0.8

 
$
7.8

 
$
—

(1) 
Excess tax benefits, which represent cash flows from tax deductions in excess of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s consolidated statements of cash flows.