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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2013
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)
2013
 
2012
 
2013
 
2012
Equity-based awards
$
4,869

 
$
4,091

 
$
18,919

 
$
15,363

Liability-based awards
995

 
779

 
3,077

 
2,350

Total stock-based compensation expense
5,864

 
4,870

 
21,996

 
17,713

Less: tax benefit
(1,735
)
 
(1,511
)
 
(6,756
)
 
(5,546
)
Total stock-based compensation expense, after tax
$
4,129

 
$
3,359

 
$
15,240

 
$
12,167