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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Compensation
Stock compensation consisted of the following:
 
Years Ended December 31,
 
2014
 
2013
 
2012
 
(In millions)
Stock compensation expense
$
5.3

 
$
6.3

 
$
6.6
Schedule of Weighted Average Assumptions Used in the Valuation of Options
The following table summarizes our weighted average assumptions used in the valuation of options for the years ended December 31:
 
2014
 
2013
 
2012
Volatility
46
%
 
43
%
 
45
%
Risk-free interest rate
1.93
%
 
1.05
%
 
1.07
%
Expected life (months)
73

 
72

 
71

Dividend yield
—
%
 
—
%
 
—
%
Schedule of Stock Option Activity
The following table summarizes our stock option activity:
 
Stock Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value
 
 
 
 
 
 
 
(millions)
Outstanding December 31, 2011
5,679,579

 
$
19.87

 
6.0
 
$
—

Granted
1,178,780

 
5.80

 
 
 
 
Exercised
—

 
—

 
 
 
 
Canceled
(752,415
)
 
26.61

 
 
 
 
Forfeited
(287,472
)
 
9.24

 
 
 
 
Outstanding December 31, 2012
5,818,472

 
$
16.57

 
5.9
 
$
—

Granted
1,034,406

 
3.85

 
 
 
 
Exercised
—

 
—

 
 
 
 
Canceled
(1,069,192
)
 
25.22

 
 
 
 
Forfeited
(412,148
)
 
7.13

 
 
 
 
Outstanding December 31, 2013
5,371,538

 
$
13.11

 
6.1
 
$
0.8

Granted
61,275

 
3.72

 
 
 
 
Exercised
(87,569
)
 
3.97

 
 
 
 
Canceled
(881,069
)
 
19.05

 
 
 
 
Forfeited
(566,189
)
 
4.14

 
 
 
 
Outstanding December 31, 2014
3,897,986

 
$
13.07

 
4.8
 
$
—
Schedule of Options Exercisable and Expected to Vest
The following table summarizes exercisable options and options expected to vest as of December 31, 2014:
 
Exercisable Options
 
Options Expected to Vest
 
 
 
Weighted
Average
Remaining
 
Weighted
Average
 
 
 
Weighted
Average
Remaining
 
Weighted
Average
Range of Exercise
Stock
 
Contractual
 
Exercise
 
Stock
 
Contractual
 
Exercise
Prices
Options
 
Life (Years)
 
Price
 
Options
 
Life (Years)
 
Price
$3.48 to $6.16
618,973

 
6.6
 
$
5.32

 
481,243

 
8.0
 
$
4.61

$6.17 to $9.64
475,772

 
4.4
 
8.66

 
4,094

 
7.1
 
6.19

$9.65 to $19.20
1,417,382

 
4.8
 
10.06

 
3,062

 
6.2
 
11.31

$19.21 to $23.95
9,500

 
3.0
 
20.20

 
—

 
0.0
 
—

$23.96 to $28.70
403,837

 
2.4
 
24.62

 
—

 
0.0
 
—

$28.71 to $39.38
323,487

 
1.1
 
35.97

 
—

 
0.0
 
—

$39.39 to $41.75
118,900

 
1.2
 
41.62

 
—

 
0.0
 
—

$41.76 to $46.97
2,500

 
1.4
 
45.76

 
—

 
0.0
 
—

$3.48 to $46.97
3,370,351

 
4.3
 
$
14.39

 
488,399

 
8.0
 
$
4.67
Schedule of Restricted Stock Activity
The following table summarizes our restricted stock activity:
 
Restricted Stock
 
Weighted Average Grant Date Fair Value Per Share
Nonvested as of December 31, 2011
795,046

 
$
10.02

Granted
708,573

 
5.67

Vested
(321,103
)
 
10.30

Forfeited
(156,712
)
 
8.72

Nonvested as of December 31, 2012
1,025,804

 
$
7.12

Granted
837,443

 
3.75

Vested
(561,099
)
 
6.99

Forfeited
(109,827
)
 
6.59

Nonvested as of December 31, 2013
1,192,321

 
$
4.87

Granted
1,229,249

 
3.65

Vested
(734,533
)
 
5.19

Forfeited
(338,120
)
 
3.95

Nonvested as of December 31, 2014
1,348,917

 
$
3.81