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Employee Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Pension Plan |  |  |
Net periodic benefit cost |  |  |
Service cost | $ 3,020 | $ 2,707 |
Interest cost | 1,728 | 2,066 |
Expected return on plan assets | (4,202) | (3,385) |
Amortization of prior service credit | (809) | 0 |
Amortization of net loss | 999 | 979 |
Special event plan closure | 0 | 0 |
Net periodic benefit cost | 736 | 2,367 |
Postretirement Benefit Plan |  |  |
Net periodic benefit cost |  |  |
Service cost | 148 | 432 |
Interest cost | 69 | 253 |
Expected return on plan assets | 0 | 0 |
Amortization of prior service credit | (3,196) | (2,021) |
Amortization of net loss | 492 | 94 |
Special event plan closure | (20,177) | 0 |
Net periodic benefit cost | (22,664) | $ (1,242) |
Estimated 2021 pension plan contribution, disclosed in prior year 10K |  |  | $ 10,000
Contribution by employer | $ 2,500 |  |

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