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Stock Compensation Plans
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [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 June 30,
 
Six Months Ended June 30,
(DOLLARS IN THOUSANDS)
2019
 
2018
 
2019
 
2018
Equity-based awards
$
10,696

 
$
7,554

 
$
18,300

 
$
15,174

Liability-based awards
2,061

 
242

 
2,791

 
397

Total stock-based compensation expense
12,757

 
7,796

 
21,091

 
15,571

Less: Tax benefit
(2,141
)
 
(1,335
)
 
(3,523
)
 
(2,898
)
Total stock-based compensation expense, after tax
$
10,616

 
$
6,461

 
$
17,568

 
$
12,673