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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Summary Of Restricted Stock Activity
A summary of restricted stock and restricted stock unit activity and changes during the year ended December 31, 2015 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2015 (non-vested)
 
669,777

 
$
44.12

 
 
Granted
 
447,544

 
49.92

 
 
Vesting (transfer/conversion to common stock)
 
(337,159
)
 
42.03

 
 
Forfeited
 
(57,637
)
 
48.40

 
 
Outstanding at December 31, 2015 (non-vested)
 
722,525

 
$
48.35

 
$
27,950
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the year ended December 31, 2015 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2015 (non-vested)
 
725,054

Granted
 
209,589

Vesting and transfer of ownership to recipients
 
(209,592
)
Forfeited
 
(87,113
)
Outstanding at December 31, 2015 (non-vested)
 
637,938