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Asset Impairment (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) aircraft | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) aircraft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Asset impairment | $ 57,054 | $ 73,421 | $ 73,386 | $ 87,368
Flight Equipment Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Asset impairment |  |  |  | $ 5,500
Number of aircraft held for sale | aircraft |  | 4 |  | 4

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