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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of total pension cost
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