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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2011
Notes to Financial Statements [Abstract]  
Summary of Options, Performance Share Units, and Restricted Share Units activity
A summary of PSU activity for the six months ended June 30, 2011 is presented below:


 
Number of Performance Stock Units
 
Weighted Average Grant Date Fair Value
Outstanding at January 1, 2011
272,356


 
$
28.88


Granted
53,795


 
$
85.40


Outstanding at June 30, 2011
326,151


 
$
38.20


A summary of option activity for the six months ended June 30, 2011 is presented below:


 
Number of Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (in years)
 
Range of Exercise Prices
Outstanding at January 1, 2011
1,452,781


 
$
37.00


 
5.7


 
$
13.83


-
$
55.90


Outstanding at June 30, 2011
1,452,781


 
$
37.00


 
5.2


 
$
13.83


-
$
55.90


 
 
 
 
 
 
 
 
 
 
Fully vested options at June 30, 2011
1,244,452


 
$
38.00


 
5.4


 
 


 
 
A summary of Restricted Share Units (RSU) activity for the six months ended June 30, 2011 is presented below:


 
Number of Restricted Stock Units
 
Weighted Average Grant Date Fair Value
Outstanding at January 1, 2011
617,884


 
$
22.72


Redeemed
(113,684
)
 
50.21


Granted March 2011
105,391


 
47.98


Granted June 2011
1,972


 
53.65


Forfeited
(1,484
)
 
18.76


Outstanding at June 30, 2011
610,079


 
$
22.07