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Pension Plan and Other Postretirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Pension Plan |  |  |  |
Pension Plan and Other Postretirement Benefits |  |  |  |
Employer cash contributions |  |  | $ 25,800 | $ 12,500
Estimated cash contributions in the current fiscal year | $ 38,000 |  | 38,000 |
Components of the pension plans and other postretirement benefits |  |  |  |
Service cost | 9,378 | $ 6,910 | 27,002 | 20,039
Interest cost | 6,440 | 6,941 | 19,306 | 20,225
Expected return on plan assets | (8,284) | (7,581) | (24,815) | (22,714)
Amortization of prior service cost | 1,058 | 1,262 | 3,172 | 3,786
Recognized net actuarial loss | 3,208 | 1,821 | 9,599 | 4,445
Net periodic benefit cost | 11,800 | 9,353 | 34,264 | 25,781
Other Benefits |  |  |  |
Pension Plan and Other Postretirement Benefits |  |  |  |
Employer cash contributions |  |  | 5,700 | 5,600
Estimated cash contributions in the current fiscal year | 7,500 |  | 7,500 |
Components of the pension plans and other postretirement benefits |  |  |  |
Service cost | 1,746 | 2,082 | 5,959 | 5,606
Interest cost | 808 | 1,407 | 3,229 | 4,081
Expected return on plan assets | (1,804) | (1,475) | (5,427) | (4,346)
Amortization of prior service cost | 50 | 49 | 148 | 148
Recognized net actuarial loss | (27) | 214 | 0 | 421
Net periodic benefit cost | $ 773 | $ 2,277 | $ 3,909 | $ 5,910

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: 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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