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Employee Benefits (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Net Periodic Benefit Cost | The components of the net periodic benefit cost for our pension and postretirement benefit plans are as follows:
| Pension Plan |  | Postretirement Benefit Plan
Three Months Ended March 31, | 2021 |  | 2020 |  | 2021 |  | 2020
Net periodic benefit cost |  |  |  |  |  |  |
Service cost | $ | 3,020 |  |  | $ | 2,707 |  |  | $ | 148 |  |  | $ | 432 |
Interest cost | 1,728 |  |  | 2,066 |  |  | 69 |  |  | 253 |
Expected return on plan assets | (4,202) |  |  | (3,385) |  |  | — |  |  | — |
Amortization of prior service credit | (809) |  |  | — |  |  | (3,196) |  |  | (2,021) |
Amortization of net loss | 999 |  |  | 979 |  |  | 492 |  |  | 94 |
Special event plan closure | — |  |  | — |  |  | (20,177) |  |  | — |
Net periodic benefit cost | $ | 736 |  |  | $ | 2,367 |  |  | $ | (22,664) |  |  | $ | (1,242) |

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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=118255775&loc=d3e1928-114920 + Details
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