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Employee Benefits (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
2018
 
2017
 
2018
 
2017
Service cost for benefits earned(1)
$
596

 
$
698

 
$
1,192

 
$
1,395

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

 
4,561

 
9,580

 
9,122

Expected return on plan assets(2)
(7,740
)
 
(9,246
)
 
(15,479
)
 
(18,492
)
Net amortization and deferrals(2)
1,549

 
1,793

 
3,098

 
3,585

Net periodic benefit income
(805
)
 
(2,194
)
 
(1,609
)
 
(4,390
)
Defined contribution and other retirement plans(1)
3,081

 
2,524

 
5,771

 
4,779

Total expense
$
2,276

 
$
330

 
$
4,162

 
$
389


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

 
$
5,610

 
$
8,939

 
$
11,220

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

 
3,911

 
8,675

 
7,822

Expected return on plan assets(2)
(12,032
)
 
(12,334
)
 
(24,064
)
 
(24,668
)
Net amortization and deferrals(2)
2,972

 
3,988

 
5,943

 
7,977

Net periodic benefit (income) cost
(252
)
 
1,175

 
(507
)
 
2,351

Defined contribution and other retirement plans(1)
1,706

 
1,616

 
3,258

 
2,913

Total expense
$
1,454

 
$
2,791

 
$
2,751

 
$
5,264
Postretirement Benefits Other Than Pension Expenses
.