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Segment Reporting (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
segment
aircraft
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
 [1]
Segment Reporting      
Number of operating segments | segment 3    
Operating revenues $ 783,400 $ 747,166 [1]  
Operating expenses 695,225 670,871 [1]  
Depreciation and amortization expense 77,585 70,114 [1]  
Interest expense 26,234 24,549 [1]  
Segment profit (loss) 67,204 52,406 [1]  
Identifiable intangible assets, other than goodwill 3,672 7,686  
Total assets 5,600,187 5,142,689 $ 5,474,400
Capital expenditures (including non-cash) 267,788 223,099  
Segments      
Segment Reporting      
Segment profit (loss) 61,941 51,746  
SkyWest Airlines      
Segment Reporting      
Operating revenues 556,294 464,916  
Operating expenses 498,875 417,330  
Depreciation and amortization expense 37,487 31,817  
Interest expense 4,476 5,799  
Total assets 2,184,306 2,238,740  
Capital expenditures (including non-cash) 36,283 33,431  
SkyWest Airlines | Segments      
Segment Reporting      
Segment profit (loss) 52,943 41,787  
ExpressJet Airlines Inc      
Segment Reporting      
Operating revenues 161,081 228,447  
Operating expenses 166,824 229,282  
Depreciation and amortization expense 11,161 14,525  
Interest expense 827 1,114  
Identifiable intangible assets, other than goodwill 3,672 7,686  
Total assets 581,722 565,839  
Capital expenditures (including non-cash) 1,338 5,654  
ExpressJet Airlines Inc | Segments      
Segment Reporting      
Segment profit (loss) (6,570) (1,949)  
SkyWest Leasing      
Segment Reporting      
Operating revenues 66,025 53,803  
Operating expenses 29,526 24,259  
Depreciation and amortization expense 28,937 23,772  
Interest expense 20,931 17,636  
Total assets 2,834,159 2,338,110  
Capital expenditures (including non-cash) $ 230,167 184,014  
SkyWest Leasing | CRJ 200      
Segment Reporting      
Number of aircraft | aircraft 4    
SkyWest Leasing | Segments      
Segment Reporting      
Segment profit (loss) $ 15,568 $ 11,908  
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.