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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 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 three months ended March 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
 
14,583

 
48.32

 
 
Vesting (transfer/conversion to common stock)
 
(26,948
)
 
31.03

 
 
Forfeited
 
(59,436
)
 
32.97

 
 
Outstanding at March 31, 2018 (non-vested)
 
1,654,387

 
$
33.71

 
$
80,833
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the three months ended March 31, 2018 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2018 (non-vested)
 
692,661

Forfeited
 
(38,126
)
Outstanding at March 31, 2018 (non-vested)
 
654,535