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Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic benefit costs for the defined benefit plans and other postretirement benefits for the three and six months ended June 30, 2021, and 2020 are as follows:
| Three months ended June 30, |  | Six months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 2,688 |  |  | 2,337 |  |  | $ | 5,423 |  |  | 4,780 |
Interest cost | 2,530 |  |  | 2,816 |  |  | 5,110 |  |  | 5,720 |
Expected return on assets | (4,742) |  |  | (4,183) |  |  | (9,494) |  |  | (8,303) |
Unrecognized actuarial loss | 1,794 |  |  | 1,834 |  |  | 3,574 |  |  | 2,592 |
Amortization of prior service cost | 13 |  |  | (665) |  |  | 25 |  |  | 76 |
Total | $ | 2,283 |  |  | 2,139 |  |  | $ | 4,638 |  |  | 4,865 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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