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Stock Compensation Plans (Tables)
3 Months Ended
Mar. 31, 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 March 31,
(DOLLARS IN THOUSANDS)
2017
 
2016
Equity-based awards
$
5,819

 
$
5,930

Liability-based awards
1,753

 
593

Total stock-based compensation expense
7,572

 
6,523

Less: tax benefit
(2,213
)
 
(1,973
)
Total stock-based compensation expense, after tax
$
5,359

 
$
4,550