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EMPLOYEE BENEFIT PLANS
3 Months Ended
Mar. 31, 2016
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 
 March 31,
Pension Benefits
 
2016

2015
Components of net periodic benefit cost:
 
 
 
 
Service cost
 
$
7,340

 
$
5,790

Interest cost
 
776

 
709

Expected return on plan assets
 
(1,106
)
 
(829
)
Amortization of prior service costs
 
13

 
13

Amortization of loss
 
194

 
311

Net periodic benefit cost
 
$
7,217

 
$
5,994

 
 
Three Months Ended 
 March 31,
Post Retirement Medical Plan
 
2016
 
2015
Components of net periodic benefit cost:
 
 
 
 
Service cost
 
$
220

 
$
244

Interest cost
 
134

 
134

Amortization of prior service costs
 
109

 
76

Amortization of loss (gain)
 

 

Net periodic benefit cost
 
$
463

 
$
454