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Employee Benefits | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Employee Benefits | EMPLOYEE BENEFITS Net Periodic Benefit Cost The components of the net periodic benefit cost for our pension and postretirement benefit plans are as follows:
| Pension Plan |  | Postretirement Benefit Plan
Three Months Ended March 31, | 2016 |  | 2015 |  | 2016 |  | 2015
Net periodic benefit cost |  |  |  |  |  |  |
Service cost | $ | 1,623 |  |  | $ | 1,669 |  |  | $ | 932 |  |  | $ | 1,305 |
Interest cost | 1,663 |  |  | 1,500 |  |  | 754 |  |  | 713 |
Expected return on plan assets | (1,988 | ) |  | (1,950 | ) |  | — |  |  | — |
Amortization of net loss | 992 |  |  | 1,136 |  |  | 379 |  |  | 731 |
Net periodic benefit cost | $ | 2,290 |  |  | $ | 2,355 |  |  | $ | 2,065 |  |  | $ | 2,749 |
Employer Contributions We previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2015 that we expected to contribute $6,384 to the pension plan in 2016. For the three-month period ended March 31, 2016, we contributed $1,595 to the pension plan. We anticipate that the total contribution in 2016 will not vary significantly from our expected contribution.

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