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EMPLOYEE BENEFIT PLANS
9 Months Ended
Sep. 30, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS
The components of net periodic benefit cost related to the Company’s defined benefit plans consisted of the following:

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Pension Benefits
2013
 
2012
 
2013
 
2012
Components of net period benefit cost:
 
 
 
 
 
 
 
Service cost
$
3,699

 
$
2,860

 
$
11,096

 
$
8,578

Interest cost
248

 
125

 
744

 
376

Expected return on plan assets
(138
)
 
(81
)
 
(414
)
 
(243
)
Amortization of prior service costs
3

 
3

 
9

 
8

Amortization of loss
105

 
8

 
315

 
23

Net periodic benefit cost
$
3,917

 
$
2,915

 
$
11,750

 
$
8,742



 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Post Retirement Medical Plan
2013
 
2012
 
2013
 
2012
Components of net period benefit cost:
 
 
 
 
 
 
 
Service cost
$
181

 
$
205

 
$
544

 
$
475

Interest cost
84

 
106

 
251

 
296

Net periodic benefit cost
$
265

 
$
311

 
$
795

 
$
771