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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary Of Restricted Stock Activity

A summary of restricted stock and restricted stock unit activity during the six months ended June 30, 2019 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2019 (non-vested)
 
1,196,914

 
$
46.81

 
 
Granted
 
40,056

 
53.27

 
 
Vesting (transfer/conversion to common stock)
 
(10,723
)
 
49.58

 
 
Forfeited
 
(21,119
)
 
45.76

 
 
Outstanding at June 30, 2019 (non-vested)
 
1,205,128

 
47.02

 
$
55,773
Summary Of Performance Share Unit Activity
A summary of performance share unit activity during the six months ended June 30, 2019 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2019 (non-vested)
 
662,431

Granted
 
6,086

Forfeited
 
(4,516
)
Outstanding at June 30, 2019 (non-vested)
 
664,001