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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment aircraft | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Operating revenues |  | $ 803,489 | $ 829,275 | $ 805,515 | $ 783,400 | $ 771,241 | $ 812,673 | $ 791,512 | $ 747,166 | $ 3,221,679 | $ 3,122,592 | [1] | $ 3,063,702 | [1]
Operating expense |  |  |  |  |  |  |  |  |  | 2,747,399 | 2,734,393 | [1] | 3,236,386 | [1]
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 334,589 | 292,768 | [1] | 284,969 | [1]
Special items | [1] |  |  |  |  |  |  |  |  |  |  |  | 465,649 |
Interest expense |  |  |  |  |  |  |  |  |  | 120,409 | 104,925 | [1] | 78,177 | [1]
Segment profit (loss) |  |  |  |  |  |  |  |  |  | 353,871 | 283,274 |  | (250,861) |
Identifiable intangible assets, other than goodwill |  |  |  |  |  | 4,896 |  |  |  |  | 4,896 |  | 8,249 |
Total assets |  | 6,313,212 |  |  |  | 5,474,400 |  |  |  | 6,313,212 | 5,474,400 |  | 5,007,966 |
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  |  | $ 1,156,276 | 689,398 |  | 1,159,001 |
CRJ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft leased to third party | aircraft |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Special items |  |  |  |  |  |  |  |  |  |  |  |  | 424,466 |
SkyWest Airlines |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | $ 2,346,251 | 2,092,368 |  | 1,878,725 |
Operating expense |  |  |  |  |  |  |  |  |  | 2,022,560 | 1,807,540 |  | 1,829,520 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 155,511 | 134,563 |  | 139,159 |
Special items |  |  |  |  |  |  |  |  |  |  |  |  | 184,295 |
Interest expense |  |  |  |  |  |  |  |  |  | 17,021 | 21,544 |  | 26,211 |
Segment profit (loss) |  |  |  |  |  |  |  |  |  | 306,670 | 263,284 |  | 22,994 |
Total assets |  | 2,531,707 |  |  |  | 2,245,051 |  |  |  | 2,531,707 | 2,245,051 |  | 2,250,276 |
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  |  | 149,731 | 124,955 |  | 57,761 |
SkyWest Airlines | CRJ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special items |  |  |  |  |  |  |  |  |  |  |  |  | 184,300 |
ExpressJet Airlines Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 564,202 | 790,282 |  | 1,043,977 |
Operating expense |  |  |  |  |  |  |  |  |  | 577,608 | 818,683 |  | 1,338,718 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 37,290 | 51,982 |  | 83,935 |
Special items |  |  |  |  |  |  |  |  |  |  |  |  | 281,354 |
Interest expense |  |  |  |  |  |  |  |  |  | 2,340 | 4,127 |  | 6,773 |
Segment profit (loss) |  |  |  |  |  |  |  |  |  | (15,746) | (32,528) |  | (301,514) |
Identifiable intangible assets, other than goodwill |  |  |  |  |  | 4,896 |  |  |  |  | 4,896 |  | 8,249 |
Total assets |  | 279,303 |  |  |  | 599,122 |  |  |  | 279,303 | 599,122 |  | 582,890 |
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  |  | 10,137 | 14,278 |  | 15,396 |
ExpressJet Airlines Inc | CRJ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special items |  |  |  |  |  |  |  |  |  |  |  |  | 240,200 |
SkyWest Leasing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 311,226 | 239,942 |  | 141,000 |
Operating expense |  |  |  |  |  |  |  |  |  | 147,231 | 108,170 |  | 68,148 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 141,788 | 106,223 |  | 61,875 |
Interest expense |  |  |  |  |  |  |  |  |  | 101,048 | 79,254 |  | 45,193 |
Segment profit (loss) |  |  |  |  |  |  |  |  |  | 62,947 | 52,518 |  | 27,659 |
Total assets |  | $ 3,502,202 |  |  |  | $ 2,630,227 |  |  |  | 3,502,202 | 2,630,227 |  | 2,174,800 |
Capital expenditures (including non-cash) |  |  |  |  |  |  |  |  |  | $ 996,408 | $ 550,165 |  | $ 1,085,844 |
[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 of this report for additional information.

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