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Employee Benefit Plans - Net Pension Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of net pension cost |  |  |
Service cost - benefits earned during the year | $ 1,430 | $ 1,707 | $ 1,343
Interest costs on projected benefit obligations | 1,169 | 1,037 | 1,009
Expected return on plan assets | (1,467) | (1,327) | (1,127)
Expected administrative expenses | 122 | 93 | 88
Amortization of prior service cost | 79 | 79 | 79
Amortization of unrecognized net loss | 0 | 140 | 11
Net periodic pension cost | $ 1,333 | $ 1,729 | $ 1,403

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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=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)(3) -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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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