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Investment in Other Companies (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) engine
Number of spare engines purchased | engine |  | 15
Long-term debt | $ 3,068,057 | $ 2,993,115
Aero Engines, LLC. |  |
Payments to acquire interest in joint venture |  | $ 22,300
Investment ownership (as a percent) |  | 75.00%
Number of spare engines sold to Aero Engines | engine |  | 15
Long-term debt | 0 |
Investment balance in Aero Engines | 25,100 |
Company's portion of income generated by Aero Engines | $ 1,200 |

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