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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 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)
 
733,270

 
28.20

 
 
Vesting (transfer/conversion to common stock)
 
(29,527
)
 
33.08

 
 
Forfeited
 
(39,209
)
 
30.58

 
 
Outstanding at June 30, 2017 (non-vested)
 
1,853,308

 
$
28.83

 
$
50,910
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the six months ended June 30, 2017 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2017 (non-vested)
 
703,939

Granted
 
21,923

Forfeited
 
(86,117
)
Outstanding at June 30, 2017 (non-vested)
 
639,745