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v3.20.4

Reclassification out of accumulated other comprehensive income (loss) (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (96,519) | $ (98,587) | $ (84,614)
Income taxes |  |  |  |  |  |  |  |  | (84,590) | (63,279) | (47,485)
Other income (expense) |  |  |  |  |  |  |  |  | 26,711 | 15,812 | (238)
Net income | $ 112,294 | $ 153,078 | $ 99,703 | $ 25,130 | $ 95,065 | $ 137,637 | $ 61,825 | $ 40,926 | 390,205 | 335,453 | $ 272,318
Reclassification out of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (2,420) | (2,257) |
Reclassification adjustment for loss on derivative instruments included in net income | Reclassification out of accumulated other comprehensive income | Interest rate contract |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (591) | (591) |
Income taxes |  |  |  |  |  |  |  |  | 145 | (140) |
Net income |  |  |  |  |  |  |  |  | (446) | (731) |
Amortization of postretirement liability losses included in net periodic benefit cost | Reclassification out of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 630 | 476 |
Other income (expense) |  |  |  |  |  |  |  |  | (2,552) | (1,962) |
Net income |  |  |  |  |  |  |  |  | (1,922) | (1,486) |
Reclassification adjustment for loss on available-for-sale investments included in net income | Reclassification out of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 14 | 10 |
Other income (expense) |  |  |  |  |  |  |  |  | (66) | (50) |
Net income |  |  |  |  |  |  |  |  | $ (52) | $ (40) |

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