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EMPLOYEE BENEFIT PLANS | 3 Months Ended
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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 |

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- Definition The entire disclosure for postemployment benefits, which may include supplemental unemployment benefits, obligations recognized for all types of benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement. Disclosure may also include discussion that an obligation for postemployment benefits is not accrued in accordance with regulation only because the amount cannot be reasonably estimated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6410195&loc=d3e80090-111668 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665 + Details
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