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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense and Related Tax Benefits
Stock-based compensation expense and related tax benefits were as follows: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(DOLLARS IN THOUSANDS)
2015
 
2014
 
2015
 
2014
Equity-based awards
$
5,495

 
$
5,593

 
$
18,355

 
$
19,627

Liability-based awards
782

 
452

 
3,355

 
3,216

Total stock-based compensation expense
6,277

 
6,045

 
21,710

 
22,843

Less: tax benefit
(1,914
)
 
(1,899
)
 
(6,326
)
 
(6,970
)
Total stock-based compensation expense, after tax
$
4,363

 
$
4,146

 
$
15,384

 
$
15,873