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Restructuring and Other Charges (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Movements in Restructuring and Related Accruals
Movements in severance-related accruals during 2016, 2017 and 2018 are as follows: 
(DOLLARS IN THOUSANDS)
Employee-Related Costs
 
Other
 
Total
Balance at January 1, 2016
$
7,882

 
$
—

 
$
7,882

Additional charges (reversals), net
(1,700
)
 
658

 
(1,042
)
Non-cash charges
—

 
(658
)
 
(658
)
Payments
(2,905
)
 
—

 
(2,905
)
Balance at December 31, 2016
3,277

 
—

 
3,277

Additional charges (reversals), net
18,309

 
1,402

 
19,711

Non-cash charges
—

 
(528
)
 
(528
)
Payments
(14,047
)
 
(456
)
 
(14,503
)
Balance at December 31, 2017
7,539

 
418

 
7,957

Additional charges (reversals), net
3,884

 
1,195

 
5,079

Non-cash charges
—

 
(418
)
 
(418
)
Payments
(7,298
)
 
(120
)
 
(7,418
)
Balance at December 31, 2018
$
4,125

 
$
1,075

 
$
5,200