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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
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, 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

 
$
40.49

 
 
Granted
 
8,132

 
36.59

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

 
 
Forfeited
 
(6,046
)
 
43.78

 
 
Outstanding at March 31, 2015 (non-vested)
 
668,864

 
$
44.03

 
$
26,935
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the three months ended March 31, 2015 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2015 (non-vested)
 
725,054

Granted
 
3,654

Forfeited
 
(11,774
)
Outstanding at March 31, 2015 (non-vested)
 
716,934