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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
(DOLLARS IN THOUSANDS)
2017
 
2016
 
2017
 
2016
Equity-based awards
$
7,074

 
$
7,844

 
$
12,893

 
$
13,774

Liability-based awards
1,298

 
1,739

 
3,051

 
2,332

Total stock-based compensation expense
8,372

 
9,583

 
15,944

 
16,106

Less: tax benefit
(2,336
)
 
(2,816
)
 
(4,549
)
 
(4,789
)
Total stock-based compensation expense, after tax
$
6,036

 
$
6,767

 
$
11,395

 
$
11,317