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Stock-Based Compensation and Other Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Share-based Compensation [Abstract]  
Summary of Activity, Restricted Share Awards
Activity, restricted share awards:
Restricted
Shares
 
Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2013
1,123,545

 
$
23.78

Granted
323,249

 
41.05

Vested
(181,195
)
 
20.26

Canceled/forfeited
(22,442
)
 
17.38

Non-vested restricted shares, as of September 30, 2014
1,243,157

 
$
28.90
Summary of Activity, Stock Options
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, 2013
495,571

 
$
11.17

 
1.96
 
$
10.7

Exercised
(210,900
)
 
9.97

 
 
 
 
Canceled/forfeited
—

 
—

 
 
 
 
Options outstanding as of September 30, 2014
284,671

 
$
12.06

 
1.54
 
$
5.3

Options exercisable as of September 30, 2014
284,671

 
$
12.06

 
1.54
 
$
5.3

(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 Activity, Employee Stock Purchase Plan
 
Nine Months Ended September 30,
Activity, employee stock purchase plan:
2014
 
2013
Cash proceeds (in millions)
$
2.5

 
$
6.0

Common shares issued
94,761

 
436,925

Weighted average per share price
$
26.60

 
$
13.69

Weighted average per share grant date fair value
$
6.34

 
$
5.55
Summary of Stock-Based Compensation Expense And Related Tax Benefits
Details of stock-based compensation expense, which is included within general and administrative expense in the condensed unaudited consolidated statement of operations for the periods indicated are as follows (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Stock-based compensation expense
$
4.1

 
$
3.0

 
$
11.6

 
$
9.6

Income Tax Effects:
 
 
 
 
 
 
 
Income tax benefit from stock-based compensation
$
1.8

 
$
4.5

 
$
8.4

 
$
7.7

Excess tax benefit from stock-based compensation (a)
$
0.1

 
$
3.0

 
$
3.5

 
$
4.4

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