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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2015
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,
 
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