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Stock-Based Compensation and Other Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Share-based Compensation [Abstract]  
Summary of Restricted Share Award Activity
Activity, restricted share awards:
Restricted
Shares
 
Per Share Weighted Average Grant Date
Fair Value
Non-vested restricted shares, as of December 31, 2012
782,281

 
$
19.10

Granted
428,262

 
31.04

Vested
(64,288
)
 
18.22

Canceled/forfeited
(15,187
)
 
15.35

Non-vested restricted shares, as of September 30, 2013
1,131,068

 
$
23.72
Summary of Stock Option Activity
Activity, stock options:
Stock 
Options
 
Per Share Weighted Average 
Exercise Price
 
Weighted Average
Remaining
Contractual Life (years)
 
Aggregate Intrinsic
Value (1)  
(in millions)
Options outstanding as of December 31, 2012
1,043,825

 
$
10.50

 
2.33
 
$
15.1

Exercised
(498,123
)
 
9.91

 
 
 
 
Canceled/forfeited
(35,000
)
 
7.74

 
 
 
 
Options outstanding as of September 30, 2013
510,702

 
$
11.27

 
2.19
 
$
9.7

Options exercisable as of September 30, 2013
510,702

 
$
11.27

 
2.19
 
$
9.7

(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 Employee Stock Purchase Plan Activity

 
Nine Months Ended September 30,
Activity, employee stock purchase plan:
2013
 
2012
Cash proceeds (in millions)
$
6.0

 
$
0.9

Number of common shares
436,925

 
67,073

Weighted average price per share
$
13.69

 
$
13.43

Weighted average grant date fair value per share
$
5.55

 
$
3.96
Summary of Tax Benefits from Stock-Based Compensation
Details of stock based compensation expense and related tax benefits for the periods indicated are as follows (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
Stock based compensation expense
$
3.0

 
$
1.2

 
$
9.6

 
$
3.4

Income tax benefit from stock based compensation
4.5

 
0.7

 
7.7

 
1.6

Excess tax benefit from stock based compensation (1)
$
3.0

 
$
0.2

 
$
4.4

 
$
0.3

(1)
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 condensed unaudited consolidated statements of cash flows.