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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [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)
2019
 
2018
 
2019
 
2018
Equity-based awards
$
8,126

 
$
6,867

 
$
26,426

 
$
22,041

Liability-based awards
39

 
1,545

 
2,830

 
1,942

Total stock-based compensation expense
8,165

 
8,412

 
29,256

 
23,983

Less: Tax benefit
(1,143
)
 
(1,422
)
 
(4,666
)
 
(4,320
)
Total stock-based compensation expense, after tax
$
7,022

 
$
6,990

 
$
24,590

 
$
19,663