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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Basic:        
Net income attributable to Allegiant Travel Company (in Dollars) $ (93,103) $ 70,543 $ (126,113) $ 127,667
Less: Net income allocated to participating securities (in Dollars) 0 (997) (236) (1,791)
Net income attributable to common stock (in Dollars) $ (93,103) $ 69,546 $ (126,349) $ 125,876
Net income per share, basic (in Dollars per share) $ (5.85) $ 4.33 $ (7.93) $ 7.85
Weighted-average shares outstanding 15,902 16,063 15,927 16,037
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ 0 $ (996) $ (236) $ (1,790)
Net Income (Loss) Available to Common Stockholders, Diluted $ (93,103) $ 69,547 $ (126,349) $ 125,877
Diluted earnings per share $ (5.85) $ 4.33 $ (7.93) $ 7.84
Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights 26 39 56 39
Adjusted weighted-average shares outstanding under treasury stock method 15,928 16,102 15,983 16,076
Participating securities excluded under two-class method (26) (33) (56) (26)
Two-Class Method, Weighted Average Number of Shares Outstanding, Diluted 15,902 16,069 15,927 16,050