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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary Of Restricted Stock Activity

A summary of restricted stock unit activity during the six months ended June 30, 2020 is presented below:
Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2020
 
1,101,781

 
$
53.30

 
 
Granted
 
62,776

 
35.58

 
 
Vested
 
(79,956
)
 
44.30

 
 
Forfeited
 
(59,494
)
 
53.41

 
 
Converted from performance share units
 
19,450

 
38.13

 
 
Outstanding at June 30, 2020
 
1,044,557

 
52.48

 
$
30,501
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the six months ended June 30, 2020 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2020
 
375,588

Vested
 
(12,129
)
Forfeited
 
(18,766
)
Converted to restricted stock units
 
(19,450
)
Outstanding at June 30, 2020
 
325,243