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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of total pension cost
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.