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Stock-Based Compensation and Other Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Share-based Compensation [Abstract]  
Schedule of Activity, Restricted Shares
Activity, restricted shares:
Restricted
Shares
 
Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2014
1,414,645

 
$
25.32

Granted
62,568

 
18.94

Vested
(188,113
)
 
18.27

Canceled/forfeited
(16,074
)
 
30.87

Non-vested restricted shares, as of June 30, 2015
1,273,026

 
$
25.97
Schedule 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 and exercisable as of December 31, 2014
284,671

 
$
12.06

 
1.29
 
$
3.0

Exercised
(64,471
)
 
8.45

 
 
 
 
Options outstanding and exercisable as of June 30, 2015
220,200

 
$
13.12

 
1.04
 
$
1.5

(a)
Amount represents the difference between the exercise price and the closing share price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.
Schedule of Activity, Employee Stock Purchase Plans
The following table provides details pertaining to the Company’s ESPPs for the periods indicated:
 
For the Six Months Ended June 30,
 
2015
 
2014
Cash proceeds (in millions)
$
0.9

 
$
1.7

Common shares issued
57,258

 
62,102

Weighted average price per share
$
16.41

 
$
26.90

Weighted average per share grant date fair value
$
4.43

 
$
6.39
Schedule of Non-Cash Stock-Based Compensation Expense and Related Tax Benefits
Details of non-cash stock-based compensation expense and related tax benefits for the periods indicated were as follows (in millions):
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Non-cash stock-based compensation expense
$
2.7

 
$
4.2

 
$
6.3

 
$
7.5

Income Tax Effects:
 
 
 
 
 
 
 
Income tax benefit from non-cash stock-based compensation
$
1.3

 
$
1.8

 
$
2.5

 
$
6.6

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

 
$
0.1

 
$
0.1

 
$
3.4

(a)
Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.