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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 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
 
9,894

 
37.68

 
 
Vesting (transfer/conversion to common stock)
 
(2,999
)
 
44.48

 
 
Forfeited
 
(13,106
)
 
43.81

 
 
Outstanding at June 30, 2015 (non-vested)
 
663,566

 
$
44.03

 
$
28,268
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the six months ended June 30, 2015 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2015 (non-vested)
 
725,054

Granted
 
4,242

Forfeited
 
(25,973
)
Outstanding at June 30, 2015 (non-vested)
 
703,323