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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of total pension cost
The components of total pension cost were as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
Service cost
$
6,144

 
$
5,426

 
$
17,563

 
$
16,275

Interest cost
8,954

 
10,368

 
27,852

 
31,097

Expected return on plan assets
(14,667
)
 
(14,688
)
 
(45,931
)
 
(44,059
)
Amortization of prior service cost
(153
)
 
(23
)
 
(459
)
 
(68
)
Amortization of net loss
7,045

 
7,773

 
23,262

 
23,316

Defined benefit plans
7,323

 
8,856

 
22,287

 
26,561

Multi-employer plans
237

 
223

 
702

 
690

Defined contribution plans
2,599

 
2,435

 
7,791

 
7,032

Total pension cost
$
10,159

 
$
11,514

 
$
30,780

 
$
34,283