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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2015
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)
2015
 
2014
 
2015
 
2014
Equity-based awards
$
7,473

 
$
9,338

 
$
12,860

 
$
14,034

Liability-based awards
666

 
1,519

 
2,573

 
2,764

Total stock-based compensation expense
8,139

 
10,857

 
15,433

 
16,798

Less: tax benefit
(2,225
)
 
(3,345
)
 
(4,412
)
 
(5,071
)
Total stock-based compensation expense, after tax
$
5,914

 
$
7,512

 
$
11,021

 
$
11,727