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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income |  | $ 200,529 | $ 681,070 | $ 557,043
Postretirement benefits: |  |  |  |
Net actuarial gain (loss) | [1] | 1,634 | (2,530) | 2,461
Amortization of prior service cost | [2] | (547) | (547) | (547)
Amortization of net loss | [3] | (28) | 0 | 0
Cumulative effect of adoption of ASU 2018-02 reclassified to retained earnings |  | 0 | 0 | 446
Total other comprehensive income |  | 1,059 | (3,077) | 2,360
Comprehensive income |  | $ 201,588 | $ 677,993 | $ 559,403
[1] | Net of income taxes of $(484), $749 and $(704) for the year ended December 31, 2020, 2019 and 2018, respectively.
[2] | Net of income taxes of $162, $162 and $162 for the year ended December 31, 2020, 2019 and 2018, respectively.
[3] | Net of income taxes of $8 for the year ended December 31, 2020.

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