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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2018
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)
2018
 
2017
 
2018
 
2017
Equity-based awards
$
6,867

 
$
7,256

 
$
22,041

 
$
20,149

Liability-based awards
1,545

 
1,396

 
1,942

 
4,447

Total stock-based compensation expense
8,412

 
8,652

 
23,983

 
24,596

Less: Tax benefit
(1,422
)
 
(2,574
)
 
(4,320
)
 
(7,123
)
Total stock-based compensation expense, after tax
$
6,990

 
$
6,078

 
$
19,663

 
$
17,473