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Share Based Compensation (Tables)
6 Months Ended
Jun. 30, 2011
Share Based Compensation [Abstract]  
Activity in Stock Option Plans
Activity in the Company's stock option plans for the first half of 2011 was as follows (in thousands, except weighted average exercise price and weighted average contractual life):

      
Predecessor Plans
     
Weighted
  
Weighted
    
   
2007
Plan
  
1998
Employee
Plan
  
1998
Directors'
Plan
  
Total
Shares
  
Average
Exercise
Price
  
Average
Contractual
Life
  
Aggregate
Intrinsic
Value
 
                       
Outstanding January 1, 2011
  1,332   1,055   190   2,577  $37.10       
Granted
  286   --   --   286  $40.63       
Exercised
  (85 )  (171 )  (17 )  (273 ) $29.69       
Forfeited and expired
  (10 )  (8 )  --   (18 ) $45.95       
Outstanding, June 30, 2011
  1,523   876   173   2,572  $38.22   5.7  $25,942 
                              
Exercisable June 30, 2011
  810   876   173   1,859  $39.88   4.7  $15,881 

Non-Vested Restricted Stock Unit Activity
The following table summarizes restricted stock unit activity through June 30, 2011 (in thousands, except weighted-average grant-date fair value amounts):

   
2007
Plan
Restricted
Stock
Units
  
Weighted
Average
Grant-Date
Fair Value
 
        
Outstanding, January 1, 2011
  330  $31.15 
Granted
  253  $38.70 
Vested
  (175 ) $32.24 
Canceled
  (3 ) $35.51 
Outstanding, June 30, 2011
  405  $35.37 
Summary of Compensation Related Cost Related to Share-Based Payments
A summary of the compensation cost related to share-based payments is as follows (in millions):

   
Quarter Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2011
   
2010
   
2011
   
2010
 
Share-based expense (net of estimated forfeitures):
                               
Stock options
 
$
0.5
   
$
0.4
   
$
1.0
   
$
0.8
 
Restricted stock units
   
1.2
     
1.4
     
2.7
     
2.6
 
Total share-based expense
   
1.7
     
1.8
     
3.7
     
3.4
 
Total recognized tax benefit
   
(0.5
)
   
(0.6
)
   
(1.0
)
   
(1.1
)
Share-based expense (net of tax)
 
$
1.2
   
$
1.2
   
$
2.7
   
$
2.3