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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Information with Respect to Stock Option Activity
Information with respect to stock option activity for 2015 is as follows:
 
Shares
(in thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2014
5,571

 
$
25.14

 
5.0
 
 
Granted
745

 
30.82

 
 
 
 
Exercised
(1,182
)
 
17.67

 
 
 
 
Forfeited
(386
)
 
30.83

 
 
 
 
Outstanding at December 31, 2015
4,748

 
$
27.49

 
5.5
 
$
13,475

Exercisable at December 31, 2015
3,621

 
$
26.58

 
4.5
 
$
12,631

Vested and expected to vest at December 31, 2015
4,691

 
$
27.45

 
5.5
 
$
13,433
Information with Respect to Restricted Stock Unit Activity
Information with respect to restricted stock unit activity for 2015 is as follows:
 
Shares
(in thousands)
 
Weighted 
Average Grant
Date Fair Value
Outstanding at December 31, 2014
2,414

 
$
22.83

Granted
932

 
29.12

Vested and distributed
(788
)
 
26.30

Forfeited
(852
)
 
14.97

Outstanding at December 31, 2015
1,706

 
$
28.89