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Stock Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
(DOLLARS IN THOUSANDS)
2016
 
2015
Equity-based awards
$
5,930

 
$
5,387

Liability-based awards
593

 
1,907

Total stock-based compensation expense
6,523

 
7,294

Less: tax benefit
(1,973
)
 
(2,187
)
Total stock-based compensation expense, after tax
$
4,550

 
$
5,107