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Restructuring and Other Charges (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Movements in Restructuring and Related Accruals
Movements in severance-related accruals during 2015, 2016 and 2017 are as follows: 
(DOLLARS IN THOUSANDS)
Employee-Related Costs
 
Other
 
Total
Balance at January 1, 2015
$
759

 
$
—

 
$
759

Additional charges (reversals), net
7,594

 
—

 
7,594

Payments
(471
)
 
—

 
(471
)
Balance at December 31, 2015
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