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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Service cost
$
5,081

 
$
5,744

 
$
10,144

 
$
11,419

Interest cost
10,615

 
9,508

 
21,277

 
18,898

Expected return on plan assets
(17,048
)
 
(15,860
)
 
(34,069
)
 
(31,264
)
Amortization of prior service cost
(152
)
 
(153
)
 
(307
)
 
(306
)
Amortization of net loss
4,209

 
8,106

 
8,431

 
16,217

Defined benefit plans
2,705

 
7,345

 
5,476

 
14,964

Multi-employer plans
267

 
226

 
531

 
465

Defined contribution plans
2,819

 
2,603

 
5,653

 
5,192

Total pension cost
$
5,791

 
$
10,174

 
$
11,660

 
$
20,621