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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Information with Respect to Stock Option Activity
Information with respect to stock option activity for 2013 is as follows:
 
Shares
(in thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2012
6,642

 
$
21.64

 
4.7
 
 
Granted
1,029

 
24.58

 
 
 
 
Exercised
(325
)
 
14.22

 
 
 
 
Forfeited
(8
)
 
21.40

 
 
 
 
Outstanding at December 31, 2013
7,338

 
$
22.38

 
4.6
 
$
61,036

Exercisable at December 31, 2013
5,973

 
$
21.82

 
3.6
 
$
53,284

Vested and expected to vest at December 31, 2013
7,270

 
$
22.36

 
4.6
 
$
60,649
Information with Respect to Restricted Stock Unit Activity
Information with respect to restricted stock unit activity for 2013 is as follows:
 
Shares
(in thousands)
 
Weighted 
Average Grant
Date Fair Value
Outstanding at December 31, 2012
2,372

 
$
24.59

Granted
1,180

 
23.93

Vested and distributed
(566
)
 
26.71

Forfeited
(198
)
 
24.03

Outstanding at December 31, 2013
2,788

 
$
21.16