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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Information with Respect to Stock Option Activity
Information with respect to stock option activity for 2012 is as follows:
 
Shares
(in thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2011
6,570

 
$
20.73

 
5.0

 
 
Granted
638

 
22.30

 
 
 
 
Exercised
(441
)
 
8.14

 
 
 
 
Forfeited
(125
)
 
24.41

 
 
 
 
Outstanding at December 31, 2012
6,642

 
$
21.64

 
4.7

 
$
23,464

Exercisable at December 31, 2012
5,732

 
$
20.81

 
4.1

 
$
23,454

Vested and expected to vest at December 31, 2012
6,597

 
$
21.61

 
4.7

 
$
23,463
Information with Respect to Restricted Stock Unit Activity
Information with respect to restricted stock unit activity for 2012 is as follows:
 
Shares
(in thousands)
 
Weighted 
Average Grant
Date Fair Value
Outstanding at December 31, 2011
1,305

 
$
30.89

Granted
1,782

 
17.23

Vested and distributed
(577
)
 
29.14

Forfeited
(138
)
 
28.26

Outstanding at December 31, 2012
2,372

 
$
24.59