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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation [Abstract]  
Summary Of Restricted Stock Activity
A summary of restricted stock and restricted stock unit activity and changes during the year ended December 31, 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
 
495,360

 
64.96

 
 
Vesting (transfer/conversion to common stock)
 
(909,755
)
 
33.01

 
 
Forfeited
 
(114,879
)
 
34.59

 
 
Outstanding at December 31, 2018 (non-vested)
 
1,196,914

 
$
46.81

 
$
61,186
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the year ended December 31, 2018 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2018 (non-vested)
 
692,661

Granted
 
139,720

Vesting and transfer of ownership to recipients
 
(115,596
)
Forfeited
 
(54,354
)
Outstanding at December 31, 2018 (non-vested)
 
662,431