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EMPLOYEE BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Schedule of net periodic benefit cost | 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 Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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