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Retirement Benefits (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) person | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) person | Jun. 30, 2018 USD ($)
Postemployment Benefits [Abstract] |  |  |  |
Service cost | $ 174 | $ 215 | $ 348 | $ 430
Interest cost | 303 | 274 | 606 | 548
Expected return on plan assets | (637) | (692) | (1,274) | (1,384)
Amortization of net loss | 213 | 129 | 425 | 257
Net Periodic Benefit Expense | $ 53 | $ (74) | $ 105 | $ (149)
Number of active, vested, terminated and retired persons in the Plan | person | 353 |  | 353 |

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