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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2016 (non-vested)
 
722,525

 
$
48.35

 
 
Granted
 
5,628

 
38.26

 
 
Forfeited
 
(9,168
)
 
48.08

 
 
Outstanding at March 31, 2016 (non-vested)
 
718,985

 
$
47.42

 
$
25,395
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the three months ended March 31, 2016 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2016 (non-vested)
 
637,938

Granted
 
2,861

Forfeited
 
(144,362
)
Outstanding at March 31, 2016 (non-vested)
 
496,437