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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Share-based Compensation [Abstract]  
Summary Of Restricted Stock Activity

A summary of restricted stock and restricted stock unit activity and changes during the nine months ended September 30, 2015 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2015 (non-vested)
 
669,777

 
$
44.12

 
 
Granted
 
12,969

 
40.33

 
 
Vesting (transfer/conversion to common stock)
 
(8,699
)
 
44.08

 
 
Forfeited
 
(16,166
)
 
43.83

 
 
Outstanding at September 30, 2015 (non-vested)
 
657,881

 
$
44.05

 
$
31,920
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the nine months ended September 30, 2015 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2015 (non-vested)
 
725,054

Granted
 
4,242

Forfeited
 
(27,131
)
Outstanding at September 30, 2015 (non-vested)
 
702,165