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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [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,
 
2016
 
2015
 
2016
 
2015
Service cost
$
4,439

 
$
5,038

 
$
8,869

 
$
10,460

Interest cost
6,018

 
10,413

 
12,029

 
20,744

Expected return on plan assets
(8,894
)
 
(16,242
)
 
(17,758
)
 
(31,980
)
Amortization of prior service cost
(99
)
 
(156
)
 
(198
)
 
(312
)
Amortization of net loss
3,648

1 
5,872

 
6,314

1 
11,692

Defined benefit plans
5,112

 
4,925

 
9,256

 
10,604

Multi-employer plans
193

 
211

 
395

 
428

Defined contribution plans
2,192

 
2,945

 
4,161

 
5,961

Total pension cost
$
7,497

 
$
8,081

 
$
13,812

 
$
16,993



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.
The Company voluntarily contributed $20,000 to its defined benefit plans in the United States during the six months ended June 30, 2016. The decrease in the components of total pension cost for the defined benefit plans in 2016 was primarily due to the purchase of a group annuity contract in August 2015.