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Employee Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Components of the Company's net periodic pension cost |  |  |  |
Service cost | $ 115 | $ 128 | $ 230 | $ 231
Interest cost | 506 | 624 | 1,006 | 1,230
Expected return on plan assets | (698) | (625) | (1,388) | (1,251)
Net amortization and deferral | 196 | 167 | 382 | 313
Net periodic pension cost | $ 119 | $ 294 | $ 230 | $ 523

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