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Restructuring and Other Charges, Net (Tables)
 6 Months Ended
Jun. 30, 2018
Restructuring and Related Activities [Abstract]  
Changes in Employee-Related Restructuring Liabilities
Changes in restructuring liabilities during the six months ended June 30, 2018, were as follows:
(DOLLARS IN THOUSANDS)
Employee-Related Costs
 
Other
 
Total
Balance at December 31, 2017
$
7,539

 
$
418

 
$
7,957

Additional charges (reversals), net
1,903

 
—

 
1,903

Payments
(4,581
)
 
—

 
(4,581
)
Balance at June 30, 2018
$
4,861

 
$
418

 
$
5,279