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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [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,
 
2017
 
2016
 
2017
 
2016
Service cost
$
735

 
$
4,439

 
$
1,469

 
$
8,869

Interest cost
5,542

 
6,018

 
11,074

 
12,029

Expected return on plan assets
(8,626
)
 
(8,894
)
 
(17,241
)
 
(17,758
)
Amortization of prior service cost
4

 
(99
)
 
8

 
(198
)
Amortization of net loss (1)
1,011

 
3,648

 
2,011

 
6,314

Defined benefit plans
(1,334
)
 
5,112

 
(2,679
)
 
9,256

Multi-employer plans
224

 
193

 
417

 
395

Defined contribution plans
5,804

 
2,192

 
12,568

 
4,161

Total pension cost (2)
$
4,694

 
$
7,497

 
$
10,306

 
$
13,812



(1) The amortization of net loss includes a $959 charge resulting from the deconsolidation of the Venezuelan subsidiary during the three and six months ended June 30, 2016.
(2) The decrease for the three and six months ended June 30, 2017 as compared to the prior year periods reflect lower service cost and lower amortization of net losses related to the defined benefit plan freeze effective December 31, 2016, partially offset by higher defined contribution plan expense related to the Company's amended U.S. defined contribution plan that was effective January 1, 2017.