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Employee Benefit Plans: | 9 Months Ended
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Sep. 30, 2022
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans Components of Net Periodic Expense The components of net periodic expense were as follows (in thousands):
| Defined Benefit Pension Plan | Supplemental Non-qualified Defined Benefit Plans | Non-pension Defined Benefit Postretirement Healthcare Plan
Three Months Ended September 30, | 2022 | 2021 | 2022 | 2021 | 2022 | 2021
Net Service cost | $ | 982 |  | $ | 1,260 |  | $ | (271) |  | $ | 235 |  | $ | 492 |  | $ | 560 |
Interest cost | 2,705 |  | 2,328 |  | 209 |  | 176 |  | 321 |  | 264 |
Expected return on plan assets | (4,631) |  | (5,219) |  | — |  | — |  | (31) |  | (34) |
Net amortization of prior service costs | (17) |  | — |  | — |  | — |  | (72) |  | (108) |
Recognized net actuarial loss | 1,522 |  | 1,828 |  | 69 |  | 439 |  | 16 |  | 116 |
Net periodic expense (benefit) | $ | 561 |  | $ | 197 |  | $ | 7 |  | $ | 850 |  | $ | 726 |  | $ | 798 |
| Defined Benefit Pension Plan | Supplemental Non-qualified Defined Benefit Plans | Non-pension Defined Benefit Postretirement Healthcare Plan
Nine Months Ended September 30, | 2022 | 2021 | 2022 | 2021 | 2022 | 2021
Net Service cost | $ | 2,946 |  | $ | 3,779 |  | $ | (2,018) |  | $ | 1,948 |  | $ | 1,476 |  | $ | 1,678 |
Interest cost | 8,114 |  | 6,984 |  | 626 |  | 530 |  | 963 |  | 793 |
Expected return on plan assets | (13,892) |  | (15,657) |  | — |  | — |  | (93) |  | (102) |
Net amortization of prior service costs | (51) |  | — |  | — |  | — |  | (217) |  | (326) |
Recognized net actuarial loss | 4,568 |  | 5,486 |  | 207 |  | 1,316 |  | 48 |  | 350 |
Net periodic expense (benefit) | $ | 1,685 |  | $ | 592 |  | $ | (1,185) |  | $ | 3,794 |  | $ | 2,177 |  | $ | 2,393 |
Plan Contributions Contributions to the Defined Benefit Pension Plan are cash contributions made directly to the Pension Plan Trust account. Contributions to the Postretirement Healthcare and Supplemental Plans are made in the form of benefit payments. Contributions made in the first nine months of 2022 and anticipated contributions for 2022 and 2023 are as follows (in thousands):
|  | Contributions Made | Additional Contributions | Contributions
|  | Nine Months Ended September 30, 2022 | Anticipated for 2022 | Anticipated for 2023
Defined Benefit Pension Plan |  | $ | — |  | $ | — |  | $ | — |
Non-pension Defined Benefit Postretirement Healthcare Plan |  | $ | 3,828 |  | $ | 1,276 |  | $ | 5,062 |
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans |  | $ | 1,617 |  | $ | 539 |  | $ | 2,224 |
Funding Status of Employee Benefit Plans Based on the fair value of assets and estimated discount rate used to value benefit obligations as of September 30, 2022, we estimate the unfunded status of our employee benefit plans to be approximately $32 million compared to $20 million at December 31, 2021. In 2012, we froze our pension plan and closed it to new participants. Since then, we have implemented various de-risking strategies including lump sum buyouts, the purchase of annuities and the reduction of return-seeking assets over time to a more liability-hedged portfolio. As a result, recent capital markets volatility had a limited impact to our unfunded status and does not require interim re-measurement of our pension plan assets or defined benefit obligations.

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