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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Share-based Compensation [Abstract]  
Information with Respect to Stock Option Activity
Information with respect to stock option activity for 2011 is as follows:
 
Shares
(in thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2010
7,403

 
$
18.69

 
5.6

 
 
Granted
397

 
35.00

 
 
 
 
Exercised
(1,148
)
 
12.06

 
 
 
 
Forfeited
(82
)
 
27.63

 
 
 
 
Outstanding at December 31, 2011
6,570

 
$
20.73

 
5.0

 
$
41,277

Exercisable at December 31, 2011
5,581

 
$
19.00

 
4.4

 
$
41,273

Vested and expected to vest at December 31, 2011
6,435

 
$
20.59

 
5.0

 
$
41,276
Information with Respect to Restricted Stock Unit Activity
Information with respect to restricted stock unit activity for 2011 is as follows:
 
Shares
(in thousands)
 
Weighted 
Average Grant
Date Fair Value
Outstanding at December 31, 2010
1,351

 
$
28.54

Granted
637

 
34.35

Vested and distributed
(576
)
 
29.06

Forfeited
(107
)
 
29.83

Outstanding at December 31, 2011
1,305

 
$
30.89