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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
Service cost
$
5,744

 
$
5,970

 
$
11,419

 
$
10,849

Interest cost
9,508

 
10,491

 
18,898

 
20,729

Expected return on plan assets
(15,860
)
 
(14,983
)
 
(31,264
)
 
(29,371
)
Amortization of prior service cost
(153
)
 
(23
)
 
(306
)
 
(45
)
Amortization of net loss
8,106

 
7,749

 
16,217

 
15,543

Defined benefit plans
7,345

 
9,204

 
14,964

 
17,705

Multi-employer plans
226

 
225

 
465

 
467

Defined contribution plans
2,603

 
2,353

 
5,192

 
4,597

Total pension cost
$
10,174

 
$
11,782

 
$
20,621

 
$
22,769