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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of total pension cost
The components of total pension cost were as follows:
 
 
Three months ended March 31,
 
 
2013
 
2012
Service cost
 
$
5,675

 
$
4,879

Interest cost
 
9,390

 
10,238

Expected return on plan assets
 
(15,404
)
 
(14,388
)
Amortization of prior service cost
 
(153
)
 
(22
)
Amortization of net loss
 
8,111

 
7,794

Defined benefit plans
 
7,619

 
8,501

Multi-employer plans
 
239

 
242

Defined contribution plans
 
2,589

 
2,244

Total pension cost
 
$
10,447

 
$
10,987