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Nature of Operations and Summary of Significant Accounting Policies - Long-Lived Assets (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) aircraft | Dec. 31, 2017 aircraft | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 07, 2005 USD ($)
Impairment of Long Lived and Intangible Assets |  |  |  |  |  |
Property and equipment and related assets | $ 5,140,005 |  | $ 5,140,005 | $ 5,556,728 |  |
Intangible assets | 8,249 |  | 8,249 | 10,499 | $ 12,748 |
Proceeds from settlement of residual value guarantee aircraft agreements | $ 125,000 |  | $ 90,000 |  |  |
CRJ 200 |  |  |  |  |  |
Impairment of Long Lived and Intangible Assets |  |  |  |  |  |
Number of aircraft removed from service | aircraft | 76 |  |  |  |  |
Proceeds from settlement of residual value guarantee aircraft agreements | $ 125,000 |  |  |  |  |
ERJ 145 |  |  |  |  |  |
Impairment of Long Lived and Intangible Assets |  |  |  |  |  |
Number of extension rights | item |  |  | 2 |  |  |
Term of extension rights |  |  | 1 year |  |  |
Atlantic Southeast Airlines Inc. |  |  |  |  |  |
Impairment of Long Lived and Intangible Assets |  |  |  |  |  |
Intangible assets related to acquisition of Atlantic Southeast |  |  |  |  |  | $ 33,700
Period for amortization of intangible assets |  |  | 15 years |  |  |
Accumulated amortization expense | $ 25,500 |  | $ 25,500 | $ 23,300 |  |
Forecast | CRJ 200 |  |  |  |  |  |
Impairment of Long Lived and Intangible Assets |  |  |  |  |  |
Number of aircraft removed from service | aircraft |  | 46 |  |  |  |
Forecast | ERJ 145 |  |  |  |  |  |
Impairment of Long Lived and Intangible Assets |  |  |  |  |  |
Number of aircraft removed from service | aircraft |  | 45 |  |  |  |

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