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Retirement Benefits (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) person | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) person | Sep. 30, 2018 USD ($)
Postemployment Benefits [Abstract] |  |  |  |
Service cost | $ 174 | $ 215 | $ 522 | $ 645
Interest cost | 303 | 274 | 909 | 822
Expected return on plan assets | (637) | (693) | (1,911) | (2,077)
Amortization of net loss | 212 | 129 | 637 | 386
Net Periodic Benefit Expense | $ 52 | $ (75) | $ 157 | $ (224)
Number of active, vested, terminated and retired persons in the Plan | person | 353 |  | 353 |

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