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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2014
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)
2014
 
2013
 
2014
 
2013
Equity-based awards
$
5,593

 
$
4,869

 
$
19,627

 
$
18,919

Liability-based awards
452

 
995

 
3,216

 
3,077

Total stock-based compensation expense
6,045

 
5,864

 
22,843

 
21,996

Less: tax benefit
(1,899
)
 
(1,735
)
 
(6,970
)
 
(6,756
)
Total stock-based compensation expense, after tax
$
4,146

 
$
4,129

 
$
15,873

 
$
15,240