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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2017
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)
2017
 
2016
 
2017
 
2016
Equity-based awards
$
7,256

 
$
5,697

 
$
20,149

 
$
19,471

Liability-based awards
1,396

 
1,836

 
4,447

 
4,168

Total stock-based compensation expense
8,652

 
7,533

 
24,596

 
23,639

Less: tax benefit
(2,574
)
 
(2,174
)
 
(7,123
)
 
(6,963
)
Total stock-based compensation expense, after tax
$
6,078

 
$
5,359

 
$
17,473

 
$
16,676