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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Share-based Compensation [Abstract]  
Summary Of Restricted Stock Activity

A summary of restricted stock and restricted stock unit activity and changes during the nine months ended September 30, 2017 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2017 (non-vested)
 
1,188,774

 
$
28.87

 
 
Granted (1)
 
735,478

 
28.19

 
 
Vesting (transfer/conversion to common stock)
 
(33,177
)
 
32.53

 
 
Forfeited
 
(49,711
)
 
30.38

 
 
Outstanding at September 30, 2017 (non-vested)
 
1,841,364

 
$
28.82

 
$
66,234
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the nine months ended September 30, 2017 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2017 (non-vested)
 
703,939

Granted
 
21,923

Forfeited
 
(88,893
)
Outstanding at September 30, 2017 (non-vested)
 
636,969