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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
 3 Months Ended
Mar. 31, 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 March 31,
 
 
2016
 
2015
Service cost
 
$
4,430

 
$
5,422

Interest cost
 
6,011

 
10,331

Expected return on plan assets
 
(8,864
)
 
(15,738
)
Amortization of prior service cost
 
(99
)
 
(156
)
Amortization of net loss
 
2,666

 
5,820

Defined benefit plans
 
4,144

 
5,679

Multi-employer plans
 
202

 
217

Defined contribution plans
 
1,969

 
3,016

Total pension cost
 
$
6,315

 
$
8,912


The Company voluntarily contributed $20,000 to its defined benefit plans in the United States during the three months ended March 31, 2016. The decrease in 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.