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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Service cost
$
4,228

 
$
6,144

 
$
14,372

 
$
17,563

Interest cost
10,647

 
8,954

 
31,924

 
27,852

Expected return on plan assets
(16,940
)
 
(14,667
)
 
(51,009
)
 
(45,931
)
Amortization of prior service cost
(154
)
 
(153
)
 
(461
)
 
(459
)
Amortization of net loss
4,815

 
7,045

 
13,246

 
23,262

Settlement/curtailment loss
1,562

 
—

 
1,562

 
—

Defined benefit plans
4,158

 
7,323

 
9,634

 
22,287

Multi-employer plans
250

 
237

 
781

 
702

Defined contribution plans
2,898

 
2,599

 
8,551

 
7,791

Total pension cost
$
7,306

 
$
10,159

 
$
18,966

 
$
30,780