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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Share-based Compensation [Abstract]  
Summary Of Restricted Stock Activity

A summary of restricted stock and restricted stock unit activity and changes during the three months ended March 31, 2013 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2013 (non-vested)
 
843,527

 
$
34.52

 
 
Granted
 
29,500

 
45.90

 
 
Vesting (transfer/conversion to common stock)
 
(97,812
)
 
25.48

 
 
Forfeited
 
(6,714
)
 
35.77

 
 
Outstanding at March 31, 2013 (non-vested)
 
768,501

 
$
36.09

 
$
39,539
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the three months ended March 31, 2013 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2013 (non-vested)
 
875,574

Granted
 
—

Vesting and transfer of ownership to recipients
 
—

Forfeited
 
(7,914
)
Outstanding at March 31, 2013 (non-vested)
 
867,660