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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Benefits |  |  |  |
Components of the net periodic benefit cost |  |  |  |
Interest cost | $ 29 | $ 32 | $ 58 | $ 65
Recognized net actuarial loss | 58 | 61 | 116 | 122
Benefit cost (income) | 87 | 93 | 174 | 187
Postretirement Benefits |  |  |  |
Components of the net periodic benefit cost |  |  |  |
Interest cost | 221 | 190 | 427 | 377
Service cost | 64 | 75 | 138 | 162
Amortization of prior service cost | (228) | (228) | (456) | (456)
Benefit cost (income) | $ 57 | $ 37 | $ 109 | $ 83

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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=118257860&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)(5) -URI http://asc.fasb.org/extlink&oid=118255775&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)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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