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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation [Abstract]  
Information with Respect to Stock Option Activity
Information with respect to stock option activity for 2014 is as follows:
 
Shares
(in thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2013
7,338

 
$
22.38

 
4.6
 
 
Granted
668

 
33.74

 
 
 
 
Exercised
(2,362
)
 
18.72

 
 
 
 
Forfeited
(73
)
 
30.80

 
 
 
 
Outstanding at December 31, 2014
5,571

 
$
25.14

 
5.0
 
$
42,547

Exercisable at December 31, 2014
4,325

 
$
24.23

 
4.0
 
$
37,022

Vested and expected to vest at December 31, 2014
5,496

 
$
25.11

 
5.0
 
$
42,147
Information with Respect to Restricted Stock Unit Activity
Information with respect to restricted stock unit activity for 2014 is as follows:
 
Shares
(in thousands)
 
Weighted 
Average Grant
Date Fair Value
Outstanding at December 31, 2013
2,788

 
$
21.16

Granted
685

 
32.80

Vested and distributed
(883
)
 
25.15

Forfeited
(176
)
 
23.67

Outstanding at December 31, 2014
2,414

 
$
22.83