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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) segment | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting |  |  |  |  |
Number of operating segments | segment |  |  | 3 |  |
Operating revenues | $ 457,493 | $ 760,295 | $ 1,537,469 | $ 2,228,372 |
Operating expense | 382,940 | 613,854 | 1,400,998 | 1,841,419 |
Depreciation and amortization expense | 121,467 | 92,795 | 364,813 | 272,929 |
Special items |  |  |  | 21,869 |
Interest expense | 30,150 | 31,606 | 91,280 | 96,884 |
Segment profit (loss) | 46,211 | 118,738 | 52,048 | 348,517 |
Total assets | 6,758,594 | 6,597,659 | 6,758,594 | 6,597,659 | $ 6,657,129
Capital expenditures (including non-cash) | 4,937 | 101,991 | 188,321 | 652,232 |
Segments |  |  |  |  |
Segment Reporting |  |  |  |  |
Segment profit (loss) | 44,403 | 114,835 | 45,191 | 290,069 |
SkyWest Airlines |  |  |  |  |
Segment Reporting |  |  |  |  |
Operating revenues | 337,975 | 641,947 | 1,172,625 | 1,854,803 |
Operating expense | 303,141 | 560,646 | 1,173,152 | 1,651,966 |
Depreciation and amortization expense | 59,659 | 43,353 | 170,855 | 124,048 |
Special items |  |  |  | 18,508 |
Interest expense | 2,868 | 3,165 | 8,847 | 10,699 |
Total assets | 2,836,069 | 2,744,191 | 2,836,069 | 2,744,191 |
Capital expenditures (including non-cash) | 4,937 | 67,394 | 73,063 | 184,019 |
SkyWest Airlines | Segments |  |  |  |  |
Segment Reporting |  |  |  |  |
Segment profit (loss) | 31,966 | 78,136 | (9,374) | 192,138 |
ExpressJet Airlines Inc |  |  |  |  |
Segment Reporting |  |  |  |  |
Operating revenues |  |  |  | 24,050 |
Operating expense |  |  |  | 28,690 |
Depreciation and amortization expense |  |  |  | 971 |
Special items |  |  |  | 3,361 |
ExpressJet Airlines Inc | Segments |  |  |  |  |
Segment Reporting |  |  |  |  |
Segment profit (loss) |  |  |  | (4,640) |
SkyWest Leasing |  |  |  |  |
Segment Reporting |  |  |  |  |
Operating revenues | 119,518 | 118,348 | 364,844 | 349,519 |
Operating expense | 79,799 | 53,208 | 227,846 | 160,763 |
Depreciation and amortization expense | 61,808 | 49,442 | 193,958 | 147,910 |
Interest expense | 27,282 | 28,441 | 82,433 | 86,185 |
Total assets | 3,922,525 | 3,853,468 | 3,922,525 | 3,853,468 |
Capital expenditures (including non-cash) |  | 34,597 | 115,258 | 468,213 |
SkyWest Leasing | Segments |  |  |  |  |
Segment Reporting |  |  |  |  |
Segment profit (loss) | $ 12,437 | $ 36,699 | $ 54,565 | $ 102,571 |

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