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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2018 (non-vested)
 
1,726,188

 
$
33.51

 
 
Granted
 
27,384

 
52.41

 
 
Vesting (transfer/conversion to common stock)
 
(28,445
)
 
31.20

 
 
Forfeited
 
(94,559
)
 
34.56

 
 
Outstanding at June 30, 2018 (non-vested)
 
1,630,568

 
$
33.81

 
$
111,466
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the six months ended June 30, 2018 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2018 (non-vested)
 
692,661

Forfeited
 
(44,008
)
Outstanding at June 30, 2018 (non-vested)
 
648,653