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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
The components of total pension cost were as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
U.S. pension plans
 
Non-U.S. pension plans
 
U.S. pension plans
 
Non-U.S. pension plans
 
U.S. pension plans
 
Non-U.S. pension plans
 
U.S. pension plans
 
Non-U.S. pension plans
Service cost
$
35

 
$
832

 
$
146

 
$
589

 
$
70

 
$
1,683

 
$
296

 
$
1,173

Interest cost
4,493

 
937

 
4,870

 
672

 
8,987

 
1,907

 
9,740

 
1,334

Expected return on plan assets
(6,915
)
 
(1,266
)
 
(7,671
)
 
(955
)
 
(13,831
)
 
(2,540
)
 
(15,342
)
 
(1,899
)
Amortization of prior service cost
—

 
—

 
—

 
4

 
—

 
1

 
—

 
8

Amortization of net loss
384

 
555

 
547

 
464

 
768

 
1,130

 
1,094

 
917

Settlement charges (1)
—

 
—

 
—

 
—

 
758

 
—

 
—

 
—

Defined benefit plans
(2,003
)

1,058

 
(2,108
)
 
774

 
(3,248
)
 
2,181

 
(4,212
)
 
1,533

Multi-employer plans
—

 
234

 
—

 
224

 
—

 
461

 
—

 
417

Defined contribution plans
5,610

 
1,036

 
5,436

 
368

 
11,504

 
1,865

 
11,834

 
734

Total pension cost
$
3,607

 
$
2,328

 
$
3,328

 
$
1,366

 
$
8,256

 
$
4,507

 
$
7,622

 
$
2,684



(1) Pension settlement charges resulting from a lump sum pension payment in the six months ended June 30, 2018.
The defined benefit plan components of Total pension cost, other than service cost, are included Other income (expense) in the Company's Consolidated Statements of Income.