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Pension and Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2016
Compensation And Retirement Disclosure [Abstract] |
Pension and Employee Benefit Plans |
11. | Pension and Employee Benefit Plans
We sponsor a non-contributory defined benefit pension plan for certain union employees. The plan is funded in accordance with the funding requirements of the Employee Retirement Income Security Act of 1974. We also sponsor a postretirement health care plan for office employees retired before January 1, 1990. The plan allowed retirees who attained the age of 65 to elect the type of coverage desired. Retirement and health care plan expense is based on valuations performed by plan actuaries as of the beginning of each fiscal year. The components of the expense consisted of the following:
(Table only in thousands) |  | Three Months Ended March 31, |
|  | 2016 |  |  | 2015 |
Pension plan: |  |  |  |  |  |  |  |
Service cost |  | $ | 112 |  |  | $ | 58 |
Interest cost |  |  | 356 |  |  |  | 354 |
Expected return on plan assets |  |  | (457 | ) |  |  | (502 | )
Amortization of net actuarial loss |  |  | 53 |  |  |  | 65 |
Net periodic benefit cost (gain) |  | $ | 64 |  |  | $ | (25 | )
Health care plan: |  |  |  |  |  |  |  |
Interest cost |  | $ | 1 |  |  | $ | 1 |
Amortization of loss |  |  | 3 |  |  |  | 2 |
Net periodic benefit cost |  | $ | 4 |  |  | $ | 3 |
We made contributions to our defined benefit plans during the three months ended March 31, 2016 and 2015 totaling $29,000 and $0.3 million, respectively. We do not anticipate any further contributions to fund the pension plans and anticipate $25,000 of contributions for the retiree health care plan during the remainder of 2016. The unfunded liability of the plans of $11.0 million as of March 31, 2016 and December 31, 2015 is included in Other Liabilities on our Condensed Consolidated Balance Sheets.

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