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Pension and Other Post-Retirement Benefits And Employee Benefits - Pension and Post-Retirement Plans (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | [1] | Mar. 31, 2020 | [1] | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |  |  |
Components of net periodic pension expense (credit): |  |  |  |  |
Interest cost | $ 912,000 | $ 1,173,000 | $ 4,692,000 | $ 5,660,000 | $ 5,085,000
Amortization of prior-service liability |  |  | 0 |  |
Expected return on plan assets | (4,016,000) | (3,876,000) | (15,505,000) | (13,933,000) | (16,139,000)
Amortization of net actuarial loss | 1,732,000 | 1,831,000 | 7,327,000 | 10,035,000 | 7,179,000
Net periodic pension (credit) expense | (1,372,000) | (872,000) | (3,486,000) | 1,762,000 | (3,875,000)
Post-Retirement Benefits |  |  |  |  |
Components of net periodic pension expense (credit): |  |  |  |  |
Interest cost | 56,000 | 82,000 | 327,000 | 512,000 | 513,000
Amortization of prior-service liability | (62,000) | (62,000) | (249,000) | (249,000) | (249,000)
Amortization of net actuarial loss | 11,000 | 6,000 | 25,000 | 124,000 | 309,000
Net periodic pension (credit) expense | $ 5,000 | $ 26,000 | $ 103,000 | $ 387,000 | $ 573,000
[1] | Amounts are included in G&A expense on the Consolidated Statements of Income and Comprehensive Income.

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