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Employee Benefit Plans: | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans Defined Benefit Pension Plan The components of net periodic benefit cost for the Defined Benefit Pension Plan were as follows (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  | 2021 | 2020
Service cost |  |  |  | $ | 1,259 |  | $ | 1,353 |
Interest cost |  |  |  | 2,328 |  | 3,357 |
Expected return on plan assets |  |  |  | (5,219) |  | (5,648) |
Net loss (gain) |  |  |  | 1,829 |  | 2,093 |
Net periodic benefit cost |  |  |  | $ | 197 |  | $ | 1,155 |
Defined Benefit Postretirement Healthcare Plan The components of net periodic benefit cost for the Defined Benefit Postretirement Healthcare Plan were as follows (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  | 2021 | 2020
Service cost |  |  |  | $ | 559 |  | $ | 514 |
Interest cost |  |  |  | 265 |  | 412 |
Expected return on plan assets |  |  |  | (34) |  | (45) |
Prior service cost (benefit) |  |  |  | (109) |  | (137) |
Net loss (gain) |  |  |  | 117 |  | 5 |
Net periodic benefit cost |  |  |  | $ | 798 |  | $ | 749 |
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans The components of net periodic benefit cost for the Supplemental Non-qualified Defined Benefit and Defined Contribution Plans were as follows (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  | 2021 | 2020
Service cost |  |  |  | $ | 693 |  | $ | (1,370) |
Interest cost |  |  |  | 177 |  | 275 |
Net loss (gain) |  |  |  | 439 |  | 426 |
Net periodic benefit cost |  |  |  | $ | 1,309 |  | $ | (669) |
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 quarter of 2021 and anticipated contributions for 2021 and 2022 are as follows (in thousands):
|  | Contributions Made | Additional Contributions | Contributions
|  | Three Months Ended March 31, 2021 | Anticipated for 2021 | Anticipated for 2022
Defined Benefit Pension Plan |  | $ | — |  | $ | — |  | $ | 3,788 |
Non-pension Defined Benefit Postretirement Healthcare Plan |  | $ | 1,382 |  | $ | 4,145 |  | $ | 5,241 |
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans |  | $ | 482 |  | $ | 1,445 |  | $ | 1,967 |

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