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Nature of Operations and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |
Schedule of the Company's position in marketable securities | The Company’s position in marketable securities as of December 31, 2017 and 2016 was as follows (in thousands):
|  |  |  |  | Gross unrealized |  | Gross unrealized |  |  |  |
At December 31, 2017 |  | Amortized Cost |  | holding gains |  | holding losses |  | Fair market value |
Total cash and cash equivalents |  | $ | 181,792 |  | $ | — |  | $ | — |  | $ | 181,792 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Bond and bond funds |  | $ | 344,479 |  | $ | — |  | $ | (228) |  | $ | 344,251 |
Commercial Paper |  |  | 159,252 |  |  | — |  |  | — |  |  | 159,252 |
Total marketable securities |  | $ | 503,731 |  | $ | — |  | $ | (228) |  | $ | 503,503 |
Total assets measured at fair value |  | $ | 685,523 |  | $ | — |  | $ | (228) |  | $ | 685,295 |
|  |  |  |  | Gross unrealized |  |  | Gross unrealized |  |  |  |
At December 31, 2016 |  | Amortized Cost |  | holding gains |  | holding losses |  | Fair market value |
Total cash and cash equivalents |  | $ | 146,766 |  | $ | — |  | $ | — |  | $ | 146,766 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Bond and bond funds |  | $ | 410,001 |  | $ | — |  | $ | (116) |  | $ | 409,885 |
Commercial Paper |  |  | 13 |  |  | — |  |  | — |  |  | 13 |
Total marketable securities |  | $ | 410,014 |  | $ | — |  | $ | (116) |  | $ | 409,898 |
Total assets measured at fair value |  | $ | 556,780 |  | $ | — |  | $ | (116) |  | $ | 556,664 |
Schedule of property and equipment |
Assets |  | Current Depreciable Life |  | Prior Policy Depreciable Life |  | Current Residual Value |  | Prior Policy Residual Value
New Aircraft |  | 20 - 22 years |  | 18 years |  | 17.5 - 20 | % |  | 30 | %
Used Aircraft, rotable spares, and spare engines |  | up to 18 years |  | up to 18 years |  | 0 - 20 | % |  | 0 - 30 | %
Ground equipment |  | up to 10 years |  | No Change |  | 0 | % |  | No Change
Office equipment |  | up to 7 years |  | No Change |  | 0 | % |  | No Change
Leasehold improvements |  | Shorter of 15 years or lease term |  | No Change |  | 0 | % |  | No Change
Buildings |  | 20 - 39.5 years |  | No Change |  | 0 | % |  | No Change
Schedule of net income (loss) per common share |
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  | $ | 428,907 |  | $ | (161,586) |  | $ | 117,817 |
Denominator: |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per-share weighted average shares |  |  | 51,804 |  |  | 51,505 |  |  | 51,077 |
Dilution due to stock options and restricted stock units |  |  | 1,296 |  |  | — |  |  | 748 |
Denominator for diluted earnings per-share weighted average shares |  |  | 53,100 |  |  | 51,505 |  |  | 51,825 |
Basic earnings (loss) per-share |  | $ | 8.28 |  | $ | (3.14) |  | $ | 2.31 |
Diluted earnings (loss) per-share |  | $ | 8.08 |  | $ | (3.14) |  | $ | 2.27 |
Delta Connection Agreements |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |
Schedule of details of aircraft and agreements with other airlines |
Agreement |  | Aircraft type |  | Number of Aircraft |  | Term / Termination Dates |
SkyWest Airlines Delta Connection Agreement (fixed-fee arrangement) |  | CRJ 200 CRJ 700 CRJ 900 E175 |  | 70 27 36 19 |  | Individual aircraft have scheduled removal dates under the agreement between 2018 and 2027 The average remaining term of the aircraft under contract is 2.9 years |
ExpressJet Delta Connection Agreement (fixed-fee arrangement) |  | CRJ 700 CRJ 900 |  | 33 16 |  | Individual aircraft have scheduled removal dates under the agreement during 2018 |
SkyWest Airlines Delta Connection Prorate Agreement (revenue-sharing arrangement) |  | CRJ 200 |  | 24 |  | Terminable with 30-day notice |
United Express Agreements |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |
Schedule of details of aircraft and agreements with other airlines |
Agreement |  | Aircraft type |  | Number of Aircraft |  | Term / Termination Dates |
SkyWest Airlines United Express Agreements (fixed-fee arrangement) |  | CRJ 200 CRJ 700 E175 |  | 57 20 65 |  | Individual aircraft have scheduled removal dates under the agreement between 2018 and 2029 The average remaining term of the aircraft under contract is 5.1 years |
ExpressJet United ERJ Agreement (fixed-fee arrangement) |  | ERJ145 ERJ135 |  | 109 3 |  | Agreement expires in 2022 The average remaining term of the aircraft under contract is 4.8 years |
SkyWest Airlines United Express Prorate Agreement (revenue-sharing arrangement) |  | CRJ 200 |  | 24 |  | Terminable with 120-day notice |
American Agreements |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |
Schedule of details of aircraft and agreements with other airlines |
Agreement |  | Aircraft type |  | Number of Aircraft |  | Term / Termination Dates |
SkyWest Airlines American Agreement (fixed-fee arrangement) |  |  CRJ 200  CRJ 700 |  | 10 37 |  |  CRJ200 aircraft are scheduled to expire in 2018 and the CRJ700 aircraft are scheduled to expire in 2019 |
SkyWest Airlines American Prorate Agreement (revenue-sharing arrangement) |  |  CRJ 200 |  | 6 |  |  Terminable with 120-day notice |
ExpressJet American Agreement (fixed-fee arrangement) |  |  CRJ 700 |  | 12 |  |  CRJ700 aircraft are scheduled to expire in 2019 |
Alaska Capacity Purchase Agreement |
Nature of Operations and Summary of Significant Accounting Policies [Line Items] |
Schedule of details of aircraft and agreements with other airlines |
Agreement |  | Aircraft type |  | Number of Aircraft |  | Term / Termination Dates |
SkyWest Airlines Alaska Agreement (fixed-fee arrangement) |  | CRJ 200 E175 |  | 4 23 |  |  CRJ200 aircraft are scheduled to expire in 2018 E175 aircraft have scheduled removal dates under the agreement between 2027 and 2029 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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