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Stock-Based Compensation and Other Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Summary Of Restricted Share Award Activity
Activity, restricted share awards:
Restricted
Shares
 
Weighted Average  
Grant Date
Fair Value
Non-vested restricted shares, as of December 31, 2011
715,030

 
$
14.44

Granted
435,005

 
21.46

Vested
(347,889
)
 
12.68

Canceled/forfeited
(19,865
)
 
15.52

Non-vested restricted shares, as of December 31, 2012
782,281

 
$
19.10

Granted
431,346

 
31.04

Vested
(68,122
)
 
18.83

Canceled/forfeited
(34,960
)
 
15.58

Non-vested restricted shares, as of December 31, 2013
1,110,545

 
$
23.86
Summary of Stock Option Activity
Activity, stock options:
Stock 
Options
 
Per Share Weighted Average 
Exercise Price
 
Weighted Average
Remaining
Contractual Life (in years)
 
Aggregate Intrinsic
Value (a)  
(in millions)
Options outstanding as of December 31, 2011
1,440,774

 
$
10.24

 
3.21
 
$
10.3

Exercised
(391,949
)
 
9.46

 
 
 
 
Canceled/forfeited
(5,000
)
 
14.97

 
 
 
 
Options outstanding as of December 31, 2012
1,043,825

 
$
10.50

 
2.33
 
$
15.1

Options exercisable as of December 31, 2012
1,043,825

 
$
10.50

 
2.33
 
$
15.1

 
 
 
 
 
 
 
 
Options outstanding as of December 31, 2012
1,043,825

 
$
10.50

 
2.33
 
$
15.1

Exercised
(513,254
)
 
10.04

 
 
 
 
Canceled/forfeited
(35,000
)
 
7.74

 
 
 
 
Options outstanding as of December 31, 2013
495,571

 
$
11.17

 
1.96
 
$
10.7

Options exercisable as of December 31, 2013
495,571

 
$
11.17

 
1.96
 
$
10.7

(a) 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 Employee Stock Purchase Plan Activity
 
Years Ended December 31,
Activity, employee stock purchase plan:
2013
 
2012
 
2011
Cash proceeds (in millions)
$
6.4

 
$
1.3

 
$
0.4

Number of common shares
454,523

 
90,614

 
29,162

Weighted average price per share
$
14.19

 
$
14.37

 
$
14.85

Weighted average grant date fair value per share
$
5.60

 
$
4.19

 
$
3.61
Summary Of Stock-Based Compensation Expense And 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,
 
2013
 
2012
 
2011
Stock-based compensation expense
$
12.9

 
$
4.4

 
$
3.6

Income tax benefit from stock-based compensation
$
9.7

 
$
2.5

 
$
6.3

Excess tax benefit from stock-based compensation (a)
$
4.3

 
$
0.8

 
$
7.8

(a) Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect 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.