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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
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, 2014 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2014 (non-vested)
 
737,562

 
$
39.54

 
 
Granted
 
56,482

 
47.92

 
 
Vesting (transfer/conversion to common stock)
 
(92,240
)
 
32.76

 
 
Forfeited
 
(56,567
)
 
41.86

 
 
Outstanding at March 31, 2014 (non-vested)
 
645,237

 
$
41.04

 
$
30,700
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the three months ended March 31, 2014 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2014 (non-vested)
 
983,610

Granted
 
23,964

Vesting and transfer of ownership to recipients
 
(181,290
)
Forfeited
 
(87,564
)
Outstanding at March 31, 2014 (non-vested)
 
738,720