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Quarterly Financial Data (Unaudited) (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares item shares | Sep. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 797,158 | $ 831,936 | $ 809,759 | $ 765,415 | $ 758,017 | $ 799,776 | $ 801,338 | $ 762,075 | $ 3,204,268 | $ 3,121,206 | $ 3,095,563
Operating income (loss) | 92,939 | 112,369 | 106,596 | 76,295 | (404,464) | 85,834 | 84,137 | 61,809 | 388,199 | (172,684) | 234,515
Net income (loss) | $ 289,928 | $ 53,716 | $ 50,477 | $ 34,786 | $ (270,244) | $ 41,322 | $ 40,244 | $ 27,092 | $ 428,907 | $ (161,586) | $ 117,817
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares | $ 5.60 | $ 1.04 | $ 0.98 | $ 0.67 | $ (5.22) | $ 0.80 | $ 0.78 | $ 0.53 | $ 8.28 | $ (3.14) | $ 2.31
Diluted (in dollars per share) | $ / shares | $ 5.46 | $ 1.01 | $ 0.95 | $ 0.65 | $ (5.22) | $ 0.79 | $ 0.77 | $ 0.52 | $ 8.08 | $ (3.14) | $ 2.27
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | shares | 51,811 | 51,833 | 51,751 | 51,820 | 51,757 | 51,627 | 51,418 | 51,218 | 51,804 | 51,505 | 51,077
Diluted (in shares) | shares | 53,140 | 53,080 | 52,977 | 53,202 | 51,757 | 52,471 | 52,194 | 52,014 | 53,100 | 51,505 | 51,825
Revaluation of deferred tax liablity |  |  |  |  |  |  |  |  | $ 246,800 |  |
Special Charge |  |  |  |  | $ 465,600 |  |  |  |  | $ 465,649 |
Number of seats on aircraft | item |  |  |  |  | 50 |  |  |  |  |  |

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