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Pension Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Service cost | $ 32 | $ 29 | $ 94 | $ 88
Interest cost | 368 | 418 | 1,134 | 1,256
Expected return on plan assets | (177) | (702) | (836) | (2,107)
Amortization of net (gain)/loss | (87) | 53 | 16 | 158
Net periodic pension cost (income) | 136 | (202) | 408 | (605)
Pension Plan [Member] |  |  |  |
Service cost |  |  |  |
Interest cost | 328 | 361 | 984 | 1,086
Expected return on plan assets | (177) | (702) | (836) | (2,107)
Amortization of net (gain)/loss | (93) | 61 | 26 | 183
Net periodic pension cost (income) | 58 | (280) | 174 | (838)
SERP [Member] |  |  |  |
Service cost | 32 | 29 | 94 | 88
Interest cost | 40 | 57 | 150 | 170
Expected return on plan assets |  |  |  |
Amortization of net (gain)/loss | 6 | (8) | (10) | (25)
Net periodic pension cost (income) | $ 78 | $ 78 | $ 234 | $ 233

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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