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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of total pension cost
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