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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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)
2016
 
2015
 
2016
 
2015
Equity-based awards
$
7,844

 
$
7,473

 
$
13,774

 
$
12,860

Liability-based awards
1,739

 
666

 
2,332

 
2,573

Total stock-based compensation expense
9,583

 
8,139

 
16,106

 
15,433

Less: tax benefit
(2,816
)
 
(2,225
)
 
(4,789
)
 
(4,412
)
Total stock-based compensation expense, after tax
$
6,767

 
$
5,914

 
$
11,317

 
$
11,021