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Quarterly Financial Data (Unaudited) (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares item shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 758,017 | $ 799,776 | $ 801,338 | $ 762,075 | $ 752,744 | $ 794,004 | $ 788,417 | $ 760,398 | $ 3,121,206 | $ 3,095,563 | $ 3,237,447
Operating income | (404,464) | 85,834 | 84,137 | 61,809 | 52,212 | 78,296 | 69,932 | 34,075 | (172,684) | 234,515 | 24,848
Net income (loss) | $ (270,244) | $ 41,322 | $ 40,244 | $ 27,092 | $ 40,454 | $ 36,268 | $ 31,475 | $ 9,620 | $ (161,586) | $ 117,817 | $ (24,154)
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares | $ (5.22) | $ 0.80 | $ 0.78 | $ 0.53 | $ 0.80 | $ 0.72 | $ 0.61 | $ 0.19 | $ (3.14) | $ 2.31 | $ (0.47)
Diluted (in dollars per share) | $ / shares | $ (5.22) | $ 0.79 | $ 0.77 | $ 0.52 | $ 0.78 | $ 0.71 | $ 0.61 | $ 0.18 | $ (3.14) | $ 2.27 | $ (0.47)
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | shares | 51,757 | 51,627 | 51,418 | 51,218 | 50,880 | 50,616 | 51,357 | 51,457 | 51,505 | 51,077 | 51,237
Diluted (in shares) | shares | 51,757 | 52,471 | 52,194 | 52,014 | 51,657 | 51,282 | 51,971 | 52,392 | 51,505 | 51,825 | 51,237
Special Charge |  |  |  |  |  |  |  |  | $ 465,649 |  | $ 74,777
Number of seats on aircraft | item |  |  |  |  |  |  |  |  | 50 |  |

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