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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Service cost
$
4,693

 
$
4,228

 
$
15,153

 
$
14,372

Interest cost
6,494

 
10,647

 
27,238

 
31,924

Expected return on plan assets
(9,003
)
 
(16,940
)
 
(40,983
)
 
(51,009
)
Amortization of prior service cost
(157
)
 
(154
)
 
(469
)
 
(461
)
Amortization of net loss
2,886

 
4,815

 
14,578

 
13,246

Settlement/curtailment loss
136,331

 
1,562

 
136,331

 
1,562

Defined benefit plans
141,244

 
4,158

 
151,848

 
9,634

Multi-employer plans
196

 
250

 
624

 
781

Defined contribution plans
1,904

 
2,898

 
7,865

 
8,551

Total pension cost
$
143,344

 
$
7,306

 
$
160,337

 
$
18,966