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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Activity of Stock Options, Including Performance-Based Options
The following table summarizes information on the activity of stock options, including performance-based options, under the 2006 and 2012 Plans for the years ended December 31:
 
2015
 
2014
 
2013
 
Shares
 
Weighted
Average
Exercise
Price Per
Share
 
Shares
 
Weighted
Average
Exercise
Price Per
Share
 
Shares
 
Weighted
Average
Exercise
Price Per
Share
Outstanding at beginning of year
11,073,326

 
$
10.25

 
11,384,251

 
$
7.62

 
12,273,815

 
$
4.24

Granted
6,262,501

 
11.16

 
2,947,199

 
17.42

 
5,494,969

 
11.57

Exercised
(1,358,761
)
 
6.86

 
(2,017,460
)
 
5.19

 
(4,489,459
)
 
3.27

Expired
(193,943
)
 
15.52

 
(14,087
)
 
13.91

 
(33,951
)
 
3.22

Forfeited
(1,602,627
)
 
12.93

 
(1,226,577
)
 
10.86

 
(1,861,123
)
 
7.40

Outstanding at end of year
14,180,496

 
$
10.60

 
11,073,326

 
$
10.25

 
11,384,251

 
$
7.62

Exercisable at end of year
6,181,833

 
$
8.90

 
5,025,485

 
$
7.13

 
4,235,609

 
$
4.39
Additional Information on Stock Options, Including Performance-Based Options, Outstanding and Exercisable
The following table summarizes additional information about stock options, including performance-based options, outstanding and exercisable as of December 31, 2015:  
 
Options Outstanding
 
Options Exercisable
Range of
Exercise Prices
Shares Under
Option
 
Weighted-
Average
Remaining
Contractual
Life
 
Weighted-
Average
Exercise Price
Per Share
 
Shares Under
Option
 
Weighted-
Average
Exercise Price
Per Share
$0.01-$3.50
1,243,295

 
2.79
 
$
2.22

 
1,242,922

 
$
2.22

$3.51 - $7.00
1,490,494

 
5.51
 
4.96

 
1,366,102

 
4.93

$7.01 - $10.50
4,613,292

 
8.75
 
8.74

 
913,376

 
8.99

$10.51 - $14.00
3,371,648

 
7.63
 
12.40

 
1,669,645

 
11.80

$14.01 - $17.50
2,099,517

 
9.10
 
15.35

 
358,076

 
15.81

$17.51 - $21.00
1,362,250

 
7.72
 
18.93

 
631,712

 
18.92

 
14,180,496

 
 
 
 
 
6,181,833

 
 
Weighted-Average Assumptions of Stock Options using Black-Scholes Option Pricing Model
The weighted-average fair value of our outstanding stock options was $4.96, $5.10, and $4.09 for the years ended December 31, 2015, 2014, and 2013, respectively. Such amounts were estimated using the Black-Scholes option pricing model with the following weighted-average assumptions at December 31:  
 
2015
 
2014
 
2013
Expected volatility
44.3
%
 
46.5
%
 
49.1
%
Expected dividend yield
—
%
 
—
%
 
—
%
Risk-free interest rate
1.7
%
 
1.8
%
 
1.3
%
Expected term (years)
6.07

 
6.05

 
6.05
Unvested Restricted Stock Units Activity
The following table summarizes restricted stock units and restricted stock awards activity under the 2012 Plan for the years ended December 31, 2014 and 2015:
 
Restricted
Stock Units/Awards
 
Weighted -
Average Grant
Date Fair
Value (per
share)
Unvested at December 31, 2013
578,243

 
$
12.65

Granted
1,131,419

 
16.41

Vested
(235,354
)
 
13.79

Forfeited
(451,484
)
 
14.77

Unvested at December 31, 2014
1,022,824

 
$
15.61

Granted
4,032,522

 
12.21

Vested
(623,835
)
 
13.20

Forfeited
(393,520
)
 
14.94

Unvested at December 31, 2015
4,037,991

 
$
12.46