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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
 3 Months Ended
Mar. 31, 2015
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,
 
2015
 
2014
Service cost
$
5,422

 
$
5,063

Interest cost
10,331

 
10,662

Expected return on plan assets
(15,738
)
 
(17,021
)
Amortization of prior service cost
(156
)
 
(155
)
Amortization of net loss
5,820

 
4,222

Defined benefit plans
5,679

 
2,771

Multi-employer plans
217

 
264

Defined contribution plans
3,016

 
2,834

Total pension cost
$
8,912

 
$
5,869


The Company voluntarily contributed $20,000 to its defined benefit plans in the United States during the three months ended March 31, 2015. The expected return on plan assets decreased due to changes in the target allocation of plan assets and the amortization of net loss increased due to a lower discount rate and the adoption of new mortality tables for the Company's U.S. defined benefit plans.