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Reclassifications Out of Accumulated Other Comprehensive Loss - Reclassifications of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income tax (expense) benefit |  | $ 50,500 |  | $ 14,915 | $ 76,695 |  | $ 128,264 | $ 135,252
Net income |  | 145,596 |  | 100,328 | 511,109 |  | 395,043 | 422,417
Interest expense |  | 105,449 |  | $ 196,575 | 607,851 |  | $ 847,760 | $ 658,678
Reclassifications, net of tax | [1] | (5,493) |  |  | (13,186) |  |  |
Past service liability |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Reclassifications, before tax | [1] | 62 | [2] |  | 249 | [3] |  |
Actuarial losses |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Reclassifications, before tax | [1] | (1,743) | [2] |  | (7,352) | [3] |  |
Amortization of defined benefit pension |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Reclassifications, before tax | [1] | (1,681) |  |  | (7,103) |  |  |
Tax benefit | [1] | 462 |  |  | 1,953 |  |  |
Reclassifications, net of tax | [1] | (1,219) |  |  | (5,150) |  |  |
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available-for-sale securities |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Net gain on securities | [1] |  |  |  | 683 |  |  |
Income tax (expense) benefit | [1] |  |  |  | (188) |  |  |
Net income | [1] |  |  |  | 495 |  |  |
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on cash flow hedges |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income tax (expense) benefit | [1] | 1,617 |  |  | 3,236 |  |  |
Net income | [1] | (4,274) |  |  | (8,531) |  |  |
Interest expense | [1] | $ (5,891) |  |  | $ (11,767) |  |  |
[1] | Amounts in parentheses indicate expense items.
[2] | See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.
[3] | See Note 14, “Employee Benefits,” for additional information.

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