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Stock Compensation Plans
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Compensation Plans
STOCK COMPENSATION PLANS
The Company has various plans under which its officers, senior management, other key employees and directors may be granted equity-based awards. Equity awards outstanding under the plans include PRSUs, restricted stock units (RSUs), SSARs and Long-Term Incentive Plan awards. Liability-based awards outstanding under the plans are cash-settled RSUs.
Stock-based compensation expense and related tax benefits were as follows: 
 
Three Months Ended March 31,
(DOLLARS IN THOUSANDS)
2018
 
2017
Equity-based awards
$
7,620

 
$
5,819

Liability-based awards
155

 
1,753

Total stock-based compensation expense
7,775

 
7,572

Less: tax benefit
(1,563
)
 
(2,213
)
Total stock-based compensation expense, after tax
$
6,212

 
$
5,359