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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options Activity
The following tables contain information on stock options issued and outstanding for the year ended December 31, 2015 :
 
 
Number of
Option Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at December 31, 2014
 
11,161,842

 
$
18.83

 
 
 
 

Exercised
 
(3,206,692
)
 
16.35

 
 
 
 

Canceled
 
(28,084
)
 
22.09

 
 
 
 

Outstanding at December 31, 2015
 
7,927,066

 
$
19.82

 
1.83
 
$
63,210

 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable
 
Exercise Price Range
 
Total
 
$14.87 to $22.92
 
$23.02 to $34.81
 
$35.74 to $35.87
 
$14.87 to $35.87
Outstanding options
 

 
 

 
 

 
 

Number outstanding
6,839,896

 
1,079,901

 
7,269

 
7,927,066

Weighted-average remaining contractual life (years)
1.95

 
1.06

 
1.67

 
1.83

Weighted-average exercise price
$
19.07

 
$
24.43

 
$
35.81

 
$
19.82

Exercisable options
 

 
 

 
 

 
 

Number outstanding
6,421,414

 
1,076,597

 
7,269

 
7,505,280

Weighted-average exercise price
$
18.88

 
$
24.43

 
$
35.81

 
$
19.69
Schedule of Share-based Compensation, Restricted Stock Awards Activity
The following table contains information on restricted stock award activity for the years ended December 31, 2015 and 2014:

        
 
Number of
Award
Shares
 
Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2013
525,328

 
$
28.34

Granted
240,149

 
$
37.12

Released
(237,618
)
 
$
24.55

Canceled
(59,018
)
 
$
31.99

Outstanding at December 31, 2014
468,841

 
$
34.31

Granted
164,612

 
$
29.37

Released
(160,234
)
 
$
33.85

Canceled
(9,455
)
 
$
32.38

Outstanding at December 31, 2015
463,764

 
$
32.76
Share-based Compensation, Performance-Based Restricted Stock Awards Activity
The following table contains information on performance-based restricted stock award activity for the years ended December 31, 2015 and 2014:

        
 
Number of  Performance-Based Award Shares
 
Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2013
—

 
$
—

Granted
613,556

 
$
22.93

Released
—

 
$
—

Canceled
(70,000
)
 
$
22.93

Outstanding at December 31, 2014
543,556

 
$
22.93

Granted
548,000

 
$
17.29

Released
—

 
$
—

Canceled
—

 
$
—

Outstanding at December 31, 2015
1,091,556

 
$
20.10