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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment aircraft | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | [1]
Segment Reporting |  |  |  |  |  |
Number of operating segments | segment |  |  |  | 3 |  |
Operating revenues | $ 805,515 | $ 791,512 | [1] | $ 1,588,915 | $ 1,538,678 |
Operating expenses | 678,837 | 684,916 | [1] | 1,374,062 | 1,355,788 |
Depreciation and amortization expense | 82,714 | 71,206 | [1] | 160,298 | 141,320 |
Interest expense | 28,811 | 27,063 | [1] | 55,045 | 51,612 |
Segment profit (loss) | 98,327 | 80,863 | [1] | 165,530 | 133,268 |
Identifiable intangible assets, other than goodwill | 2,448 | 7,124 |  | 2,448 | 7,124 |
Total assets | 5,913,093 | 5,345,145 |  | 5,913,093 | 5,345,145 | $ 5,474,400
Capital expenditures (including non-cash) | 364,717 | 295,802 |  | 632,505 | 518,901 |
Segments |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Segment profit (loss) | 97,867 | 79,533 |  | 159,808 | 131,278 |
SkyWest Airlines |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Operating revenues | 587,480 | 519,708 |  | 1,143,775 | 984,624 |
Operating expenses | 494,143 | 442,600 |  | 993,019 | 859,931 |
Depreciation and amortization expense | 38,841 | 32,530 |  | 76,327 | 64,347 |
Interest expense | 4,202 | 5,735 |  | 8,678 | 11,535 |
Total assets | 2,222,784 | 2,235,863 |  | 2,222,784 | 2,235,863 |
Capital expenditures (including non-cash) | 40,039 | 25,346 |  | 76,322 | 58,777 |
SkyWest Airlines | Segments |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Segment profit (loss) | 89,135 | 71,373 |  | 142,078 | 113,158 |
ExpressJet Airlines Inc |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Operating revenues | 143,707 | 211,819 |  | 304,788 | 440,266 |
Operating expenses | 148,525 | 214,864 |  | 315,349 | 444,146 |
Depreciation and amortization expense | 10,200 | 11,710 |  | 21,362 | 26,235 |
Interest expense | 788 | 1,088 |  | 1,615 | 2,202 |
Identifiable intangible assets, other than goodwill | 2,448 | 7,124 |  | 2,448 | 7,124 |
Total assets | 563,198 | 529,175 |  | 563,198 | 529,175 |
Capital expenditures (including non-cash) | 1,588 | 4,501 |  | 2,926 | 10,155 |
ExpressJet Airlines Inc | Segments |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Segment profit (loss) | (5,606) | (4,133) |  | (12,176) | (6,082) |
SkyWest Leasing |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Operating revenues | 74,328 | 59,985 |  | 140,352 | 113,788 |
Operating expenses | 36,169 | 27,452 |  | 65,694 | 51,711 |
Depreciation and amortization expense | 33,673 | 26,966 |  | 62,609 | 50,738 |
Interest expense | 23,821 | 20,240 |  | 44,752 | 37,875 |
Total assets | 3,127,111 | 2,580,107 |  | 3,127,111 | 2,580,107 |
Capital expenditures (including non-cash) | 323,090 | 265,955 |  | $ 553,257 | 449,969 |
SkyWest Leasing | CRJ 200 |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  | 4 |  |
SkyWest Leasing | Segments |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |
Segment profit (loss) | $ 14,338 | $ 12,293 |  | $ 29,906 | $ 24,202 |
[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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