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v3.20.4

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 22, 2019 | 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
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 589,638 | $ 457,493 | $ 350,039 | $ 729,936 | $ 743,591 | $ 760,295 | $ 744,383 | $ 723,694 | $ 2,127,106 | $ 2,971,963 | $ 3,221,679
Operating income |  | (27,669) | 74,553 | (4,403) | 66,321 | 125,305 | 146,441 | 144,093 | 96,419 | 108,802 | 512,258 | 474,280
Net income |  | $ (46,450) | $ 33,662 | $ (25,715) | $ 29,988 | $ 72,527 | $ 91,339 | $ 88,052 | $ 88,181 | $ (8,515) | $ 340,099 | $ 280,372
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  | $ (0.93) | $ 0.67 | $ (0.51) | $ 0.60 | $ 1.44 | $ 1.80 | $ 1.72 | $ 1.71 | $ (0.17) | $ 6.68 | $ 5.40
Diluted (in dollars per share) |  | $ (0.93) | $ 0.66 | $ (0.51) | $ 0.59 | $ 1.43 | $ 1.79 | $ 1.71 | $ 1.69 | $ (0.17) | $ 6.62 | $ 5.30
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) |  | 50,181,000 | 50,181,000 | 50,140,000 | 50,277,000 | 50,395,000 | 50,746,000 | 51,145,000 | 51,440,000 | 50,195,000 | 50,932,000 | 51,914,000
Diluted (in shares) |  | 50,181,000 | 50,622,000 | 50,140,000 | 50,559,000 | 50,796,000 | 51,129,000 | 51,477,000 | 52,098,000 | 50,195,000 | 51,375,000 | 52,871,000
Gain on sale of subsidiary | $ 46,500 |  |  |  |  |  |  |  | $ 46,500 |  | $ 46,525 |
Special items |  |  |  |  |  |  |  |  | $ 21,900 |  | $ 21,869 |

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