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Pension and Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2021
Compensation And Retirement Disclosure [Abstract] |
Pension and Employee Benefit Plans | 10. 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. We present the components of net periodic benefit cost (gain) within “Other income” on the Condensed Consolidated Statements of Operations. 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:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
(table only in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Pension plan: |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 194 |  |  | $ | 259 |  |  | $ | 582 |  |  | $ | 775 |
Expected return on plan assets |  |  | (378 | ) |  |  | (443 | ) |  |  | (1,133 | ) |  |  | (1,151 | )
Amortization of net actuarial loss |  |  | 103 |  |  |  | 67 |  |  |  | 308 |  |  |  | 199 |
Net periodic benefit (gain) cost |  | $ | (81 | ) |  | $ | (117 | ) |  | $ | (243 | ) |  | $ | (177 | )
Health care plan: |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Amortization of loss |  |  | 2 |  |  |  | 2 |  |  |  | 6 |  |  |  | 6 |
Net periodic benefit cost |  | $ | 3 |  |  | $ | 3 |  |  | $ | 8 |  |  | $ | 8 |
We made contributions to our defined benefit plans of zero and approximately $0.1 million during the nine months ended September 30, 2021 and 2020, respectively. For the remainder of 2021, we do not expect to make any contributions to fund the pension plan or the retiree health care plan. The unfunded liability of the plans of $9.5 million and $9.7 million as of September 30, 2021 and December 31, 2020, respectively, is included in “Other liabilities” on our Condensed Consolidated Balance Sheets.

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