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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Pension and Other Defined Contribution Retirement Plan Expenses
Pension and other defined contribution retirement plan expenses included the following components:
(DOLLARS IN THOUSANDS)
U.S. Plans
Three Months Ended September 30,
 
Nine Months Ended September 30,
2018
 
2017
 
2018
 
2017
Service cost for benefits earned(1)
$
596

 
$
698

 
$
1,788

 
$
2,094

Interest cost on projected benefit obligation(2)
4,790

 
4,561

 
14,370

 
13,682

Expected return on plan assets(2)
(7,740
)
 
(9,246
)
 
(23,219
)
 
(27,738
)
Net amortization and deferrals(2)
1,549

 
1,793

 
4,647

 
5,379

Net periodic benefit income
(805
)
 
(2,194
)
 
(2,414
)
 
(6,583
)
Defined contribution and other retirement plans(1)
2,396

 
1,939

 
8,167

 
6,718

Total expense
$
1,591

 
$
(255
)
 
$
5,753

 
$
135


(DOLLARS IN THOUSANDS)
Non-U.S. Plans
Three Months Ended September 30,
 
Nine Months Ended September 30,
2018
 
2017
 
2018
 
2017
Service cost for benefits earned(1)
$
4,470

 
$
5,956

 
$
13,410

 
$
17,080

Interest cost on projected benefit obligation(2)
4,338

 
4,066

 
13,014

 
11,825

Expected return on plan assets(2)
(12,032
)
 
(12,873
)
 
(36,096
)
 
(37,340
)
Net amortization and deferrals(2)
2,972

 
4,185

 
8,916

 
12,096

Net periodic benefit (income) cost
(252
)
 
1,334

 
(756
)
 
3,661

Defined contribution and other retirement plans(1)
1,644

 
1,470

 
4,901

 
4,383

Total expense
$
1,392

 
$
2,804

 
$
4,145

 
$
8,044
Postretirement Benefits Other Than Pension Expenses
Expense recognized for postretirement benefits other than pensions included the following components: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(DOLLARS IN THOUSANDS)
2018
 
2017
 
2018
 
2017
Service cost for benefits earned
$
196

 
$
221

 
$
587

 
$
663

Interest cost on projected benefit obligation
654

 
588

 
1,962

 
1,764

Net amortization and deferrals
(1,189
)
 
(1,046
)
 
(3,567
)
 
(3,138
)
Total postretirement benefit income
$
(339
)
 
$
(237
)
 
$
(1,018
)
 
$
(711
)