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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS
 6 Months Ended
Jun. 30, 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 June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Service cost
$
5,038

 
$
5,081

 
$
10,460

 
$
10,144

Interest cost
10,413

 
10,615

 
20,744

 
21,277

Expected return on plan assets
(16,242
)
 
(17,048
)
 
(31,980
)
 
(34,069
)
Amortization of prior service cost
(156
)
 
(152
)
 
(312
)
 
(307
)
Amortization of net loss
5,872

 
4,209

 
11,692

 
8,431

Defined benefit plans
4,925

 
2,705

 
10,604

 
5,476

Multi-employer plans
211

 
267

 
428

 
531

Defined contribution plans
2,945

 
2,819

 
5,961

 
5,653

Total pension cost
$
8,081

 
$
5,791

 
$
16,993

 
$
11,660


The Company voluntarily contributed $45,000 to its defined benefit plans in the United States during the six months ended June 30, 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.