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Retirement Benefits (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) person | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) person | Sep. 30, 2017 USD ($)
Postemployment Benefits [Abstract] |  |  |  |
Service cost | $ 215 | $ 210 | $ 645 | $ 630
Interest cost | 274 | 284 | 822 | 852
Expected return on plan assets | (693) | (630) | (2,077) | (1,890)
Amortization of net loss | 129 | 169 | 386 | 507
Net Periodic Benefit Expense | $ (75) | $ 33 | $ (224) | $ 99
Number of active, vested, terminated and retired persons in the Plan | person | 353 |  | 353 |

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