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Retirement Benefits (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) person | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) person | Sep. 30, 2016 USD ($)
Postemployment Benefits [Abstract] |  |  |  |
Service cost | $ 210 | $ 199 | $ 630 | $ 597
Interest cost | 284 | 284 | 852 | 852
Expected return on plan assets | (630) | (609) | (1,890) | (1,824)
Amortization of net loss | 169 | 172 | 507 | 513
Net Periodic Benefit Expense | $ 33 | $ 46 | $ 99 | $ 138
Number of active, vested, terminated and retired persons in the Plan | person | 358 |  | 358 |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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