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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment aircraft | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | [1]
Segment Reporting |  |  |  |  |  |
Number of operating segments | segment |  |  |  | 3 |  |
Operating revenues | $ 829,275 | $ 812,673 | [1] | $ 2,418,190 | $ 2,351,351 |
Operating expenses | 691,350 | 700,304 | [1] | 2,065,412 | 2,056,092 |
Depreciation and amortization expense | 86,088 | 74,095 | [1] | 246,386 | 215,415 |
Interest expense | 31,440 | 27,101 | [1] | 86,485 | 78,713 |
Segment profit (loss) | 109,925 | 86,676 | [1] | 275,455 | 219,944 |
Identifiable intangible assets, other than goodwill | 1,224 | 6,121 |  | 1,224 | 6,121 |
Total assets | 6,184,860 | 5,373,995 |  | 6,184,860 | 5,373,995 | $ 5,474,400
Capital expenditures (including non-cash) | 321,566 | 53,499 |  | 954,071 | 572,400 |
Segments |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Segment profit (loss) | 106,485 | 85,268 |  | 266,293 | 216,546 |
SkyWest Airlines |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Operating revenues | 607,052 | 558,994 |  | 1,750,827 | 1,543,618 |
Operating expenses | 512,278 | 472,000 |  | 1,505,298 | 1,331,931 |
Depreciation and amortization expense | 39,651 | 34,049 |  | 115,979 | 98,396 |
Interest expense | 4,044 | 5,276 |  | 12,722 | 16,811 |
Total assets | 2,251,563 | 2,072,597 |  | 2,251,563 | 2,072,597 |
Capital expenditures (including non-cash) | 44,689 | 27,118 |  | 121,010 | 85,895 |
SkyWest Airlines | Segments |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Segment profit (loss) | 90,730 | 81,718 |  | 232,807 | 194,876 |
ExpressJet Airlines Inc |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Operating revenues | 140,155 | 191,368 |  | 444,943 | 631,634 |
Operating expenses | 139,736 | 200,344 |  | 455,084 | 644,490 |
Depreciation and amortization expense | 8,683 | 12,573 |  | 30,044 | 38,808 |
Interest expense | 649 | 1,017 |  | 2,264 | 3,219 |
Identifiable intangible assets, other than goodwill | 1,224 | 6,121 |  | 1,224 | 6,121 |
Total assets | 565,266 | 721,939 |  | 565,266 | 721,939 |
Capital expenditures (including non-cash) | 3,069 | 2,259 |  | 5,996 | 12,414 |
ExpressJet Airlines Inc | Segments |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Segment profit (loss) | (230) | (9,993) |  | (12,405) | (16,075) |
SkyWest Leasing |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Operating revenues | 82,068 | 62,311 |  | 222,420 | 176,099 |
Operating expenses | 39,336 | 27,960 |  | 105,030 | 79,671 |
Depreciation and amortization expense | 37,754 | 27,473 |  | 100,363 | 78,211 |
Interest expense | 26,747 | 20,808 |  | 71,499 | 58,683 |
Total assets | 3,368,031 | 2,579,459 |  | 3,368,031 | 2,579,459 |
Capital expenditures (including non-cash) | 273,808 | 24,122 |  | $ 827,065 | 474,091 |
SkyWest Leasing | CRJ 200 |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  | 4 |  |
SkyWest Leasing | Segments |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Segment profit (loss) | $ 15,985 | $ 13,543 |  | $ 45,891 | $ 37,745 |
[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.

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