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Restructuring Charges (Summary of Restructuring Charges) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 05, 2020 airplane | Sep. 30, 2020 USD ($) airplane | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) airplane | Sep. 30, 2019 USD ($) | Jun. 30, 2020 airplane
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of airplanes held for sale (in airplanes) | airplane |  | 2 |  | 2 |  | 2
Restructuring expenses |  | $ 4,982 | $ 0 | $ 46,379 | $ 0 |
Subsequent Event |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of airplanes sold (in airplanes) | airplane | 1 |  |  |  |  |
Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  | 2,635 |  | 22,502 |  |
Pension and termination benefit charges |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  | 0 |  | 10,913 |  |
Contract exit costs and other |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  | $ 2,347 |  | $ 12,964 |  |

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