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Stock Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [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)
2020
 
2019
Equity-based awards
$
8,624

 
$
7,604

Liability-based awards
(639
)
 
730

Total stock-based compensation expense
7,985

 
8,334

Less: Tax benefit
(1,394
)
 
(1,382
)
Total stock-based compensation expense, after tax
$
6,591

 
$
6,952