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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 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 year ended December 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
 
464,189

 
42.03

 
 
Vesting (transfer / conversion to common stock)
 
(452,711
)
 
40.21

 
 
Forfeited
 
(79,263
)
 
42.29

 
 
Outstanding at December 31, 2014 (non-vested)
 
669,777

 
$
40.49

 
$
24,180
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the year ended December 31, 2014 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2014 (non-vested)
 
983,610

Granted
 
283,769

Vesting and transfer of ownership to recipients
 
(425,170
)
Forfeited
 
(117,155
)
Outstanding at December 31, 2014 (non-vested)
 
725,054