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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment aircraft | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |
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 expense |  |  |  |  |  |  |  |  | 2,816,069 | 3,293,890 | 2,861,048
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 292,768 | 284,969 | 264,507
Special items |  |  |  |  | 465,600 |  |  |  |  | 465,649 |
Interest expense |  |  |  |  |  |  |  |  | 104,925 | 78,177 | 75,850
Segment profit (loss) |  |  |  |  |  |  |  |  | 283,274 | (250,861) | 158,665
Identifiable intangible assets, other than goodwill | 4,896 |  |  |  | 8,249 |  |  |  | 4,896 | 8,249 | 10,499
Total assets | 5,458,279 |  |  |  | 5,007,966 |  |  |  | 5,458,279 | 5,007,966 | 4,781,984
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  | $ 689,398 | 1,159,001 | 715,089
CRJ 200 |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of aircraft lease to third party | aircraft |  |  |  |  |  |  |  |  | 4 |  |
Special items |  |  |  |  |  |  |  |  |  | 424,466 |
SkyWest Airlines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 2,173,384 | 1,935,378 | 1,848,363
Operating expense |  |  |  |  |  |  |  |  | 1,888,556 | 1,886,173 | 1,630,200
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 134,563 | 139,159 | 141,189
Special items |  |  |  |  |  |  |  |  |  | 184,295 |
Interest expense |  |  |  |  |  |  |  |  | 21,544 | 26,211 | 36,141
Segment profit (loss) |  |  |  |  |  |  |  |  | 263,284 | 22,994 | 182,022
Total assets | 2,228,930 |  |  |  | 2,250,276 |  |  |  | 2,228,930 | 2,250,276 | 2,300,388
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  | 124,955 | 57,761 | 30,897
ExpressJet Airlines Inc |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 790,942 | 1,044,828 | 1,169,923
Operating expense |  |  |  |  |  |  |  |  | 819,343 | 1,339,569 | 1,192,070
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 51,982 | 83,935 | 86,382
Special items |  |  |  |  |  |  |  |  |  | 281,354 |
Interest expense |  |  |  |  |  |  |  |  | 4,127 | 6,773 | 12,091
Segment profit (loss) |  |  |  |  |  |  |  |  | (32,528) | (301,514) | (34,238)
Identifiable intangible assets, other than goodwill | 4,896 |  |  |  | 8,249 |  |  |  | 4,896 | 8,249 | 10,499
Total assets | 599,122 |  |  |  | 582,890 |  |  |  | 599,122 | 582,890 | 1,331,000
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  | 14,278 | 15,396 | 24,679
ExpressJet Airlines Inc | CRJ 200 |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Special items |  |  |  |  |  |  |  |  | 240,200 |  |
SkyWest Leasing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 239,942 | 141,000 | 77,277
Operating expense |  |  |  |  |  |  |  |  | 108,170 | 68,148 | 38,778
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 106,223 | 61,875 | 36,936
Interest expense |  |  |  |  |  |  |  |  | 79,254 | 45,193 | 27,618
Segment profit (loss) |  |  |  |  |  |  |  |  | 52,518 | 27,659 | 10,881
Total assets | $ 2,630,227 |  |  |  | $ 2,174,800 |  |  |  | 2,630,227 | 2,174,800 | 1,150,596
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  | $ 550,165 | $ 1,085,844 | $ 659,513

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