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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2012
Share-based Compensation [Abstract]  
Summary Of Restricted Stock Activity
A summary of restricted stock activity and changes during the six months ended June 30, 2012 is presented below:
Restricted Stock
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2012 (non-vested)
 
1,122,350

 
$
25.48

 
 
Granted
 
407,037

 
33.81

 
 
Vesting and transfer of ownership to recipients
 
(571,238
)
 
23.40

 
 
Forfeited
 
(3,975
)
 
33.06

 
 
Outstanding at June 30, 2012 (non-vested)
 
954,174

 
$
30.25

 
$
33,806
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the six months ended June 30, 2012 is presented below:

Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2012 (non-vested)
 
774,788

Granted
 
293,559

Vesting and transfer of ownership to recipients
 
(240,019
)
Forfeited
 
(5,057
)
Outstanding at June 30, 2012 (non-vested)
 
823,271