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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment aircraft | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |
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 expense |  |  |  |  |  |  |  |  | 3,293,890 | 2,861,048 | 3,212,599
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 284,969 | 264,507 | 259,642
Special items |  |  |  |  |  |  |  |  | 465,649 |  | 74,777
Interest expense |  |  |  |  |  |  |  |  | 78,177 | 75,850 | 65,995
Segment profit (loss) |  |  |  |  |  |  |  |  | (250,861) | 158,665 | (41,147)
Identifiable intangible assets, other than goodwill | 8,249 |  |  |  | 10,499 |  |  |  | 8,249 | 10,499 | 12,748
Total assets | 5,137,251 |  |  |  | 4,781,984 |  |  |  | 5,137,251 | 4,781,984 | 4,388,818
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  | $ 1,159,001 | 715,089 | 696,923
CRJ 200 |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of aircraft lease to third party | aircraft |  |  |  |  |  |  |  |  | 2 |  |
Special items |  |  |  |  |  |  |  |  | $ 424,466 |  |
SkyWest Airlines |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,935,378 | 1,848,363 | 1,873,675
Operating expense |  |  |  |  |  |  |  |  | 1,886,173 | 1,630,200 | 1,758,145
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 139,159 | 141,189 | 162,699
Special items |  |  |  |  |  |  |  |  | 184,295 |  | 57,046
Interest expense |  |  |  |  |  |  |  |  | 26,211 | 36,141 | 39,451
Segment profit (loss) |  |  |  |  |  |  |  |  | 22,994 | 182,022 | 76,079
Total assets | 2,343,814 |  |  |  | 2,300,388 |  |  |  | 2,343,814 | 2,300,388 | 2,475,283
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  | 57,761 | 30,897 | 137,678
ExpressJet Airlines Inc |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,044,828 | 1,169,923 | 1,346,859
Operating expense |  |  |  |  |  |  |  |  | 1,339,569 | 1,192,070 | 1,446,050
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 83,935 | 86,382 | 88,459
Special items |  |  |  |  |  |  |  |  | 281,354 |  | 17,731
Interest expense |  |  |  |  |  |  |  |  | 6,773 | 12,091 | 18,754
Segment profit (loss) |  |  |  |  |  |  |  |  | (301,514) | (34,238) | (117,945)
Identifiable intangible assets, other than goodwill | 8,249 |  |  |  | 10,499 |  |  |  | 8,249 | 10,499 | 12,748
Total assets | 618,637 |  |  |  | 1,331,000 |  |  |  | 618,637 | 1,331,000 | 1,386,564
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  | 15,396 | 24,679 | 23,790
ExpressJet Airlines Inc | CRJ 200 |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Special items |  |  |  |  |  |  |  |  | 240,200 |  |
SkyWest Leasing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 141,000 | 77,277 | 16,913
Operating expense |  |  |  |  |  |  |  |  | 68,148 | 38,778 | 8,404
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 61,875 | 36,936 | 8,484
Interest expense |  |  |  |  |  |  |  |  | 45,193 | 27,618 | 7,790
Segment profit (loss) |  |  |  |  |  |  |  |  | 27,659 | 10,881 | 719
Total assets | $ 2,174,800 |  |  |  | $ 1,150,596 |  |  |  | 2,174,800 | 1,150,596 | 526,971
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  | $ 1,085,844 | $ 659,513 | $ 535,455

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