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Employee Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Pension Plan |  |  |
Net periodic benefit cost |  |  |
Service cost | $ 1,997 | $ 2,175 |
Interest cost | 2,080 | 1,875 |
Expected return on plan assets | (2,696) | (2,625) |
Amortization of prior service credit | 0 | 0 |
Amortization of net loss | 901 | 1,071 |
Net periodic benefit cost | 2,282 | 2,496 |
Estimated 2019 pension plan contribution, disclosed in prior year 10K |  |  | $ 4,000
Contribution by employer | 1,000 |  |
Postretirement Benefit Plan |  |  |
Net periodic benefit cost |  |  |
Service cost | 456 | 749 |
Interest cost | 319 | 502 |
Expected return on plan assets | 0 | 0 |
Amortization of prior service credit | (2,021) | (1,352) |
Amortization of net loss | 223 | 589 |
Net periodic benefit cost | $ (1,023) | $ 488 |

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