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Accumulated Other Comprehensive Income - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income into Consolidated Statement of Operations (Details) - 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
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |  |  | $ 105,391 | $ 94,870 | $ 96,641
Amortization of net (gain) loss | [1] |  |  |  |  |  |  |  |  | 28 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  | 241,123 | 900,224 | 698,137
Income tax expense |  |  |  |  |  |  |  |  |  | (40,594) | (219,154) | $ (141,094)
Accounting Standards Update [Extensible List] |  |  |  |  |  |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201802Member
Net income |  | $ 131,206 | $ (14,961) | $ 30,374 | $ 53,910 | $ 146,940 | $ 90,358 | $ 181,009 | $ 262,763 | 200,529 | 681,070 | $ 557,043
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net (gain) loss |  |  |  |  |  |  |  |  |  | 36 | 0 | 0
Amortization of prior service cost | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |  |  | 709 | 709 | 709
Postretirement Benefits | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | 745 | 709 | 709
Income tax expense |  |  |  |  |  |  |  |  |  | (170) | (162) | (162)
Cumulative effect of adoption of ASU 2018-02 reclassified to retained earnings |  |  |  |  |  |  |  |  |  | 0 | 0 | (446)
Net income |  |  |  |  |  |  |  |  |  | $ 575 | $ 547 | $ 101
[1] | Net of income taxes of $8 for the year ended December 31, 2020.

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