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Investments (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 aircraft | Sep. 30, 2019 USD ($) aircraft item | Dec. 31, 2018 USD ($) aircraft | Aug. 01, 2018 USD ($)
Blackbird I and Blackbird II |  |  |  |
Investments |  |  |  |
Number of joint ventures | item |  | 2 |  |
Equity method investment |  | $ 45,900,000 | $ 40,600,000 |
Blackbird Capital I |  |  |  |
Investments |  |  |  |
Percentage of equity ownership |  | 9.50% |  |
Blackbird Capital II |  |  |  |
Investments |  |  |  |
Percentage of equity ownership |  | 9.50% |  |
Total unfunded commitment |  | $ 30,500,000 |  |
Thunderbolt II |  |  |  |
Investments |  |  |  |
Non-controlling interest (as a percent) |  |  |  | 5.10%
Cost Method Investments |  |  | $ 5,400,000 |
Aircraft Held For Sale |  |  |  |
Investments |  |  |  |
Number of aircraft sold or agreed to be sold | aircraft | 6 | 6 | 6 |
Aircraft Held For Sale | Thunderbolt II |  |  |  |
Investments |  |  |  |
Number of aircraft sold or agreed to be sold | aircraft |  | 3 |  |
Long-lived assets held for sale |  |  |  | $ 18
Forecast | Aircraft Held For Sale | Thunderbolt II |  |  |  |
Investments |  |  |  |
Number of aircraft | aircraft | 3 |  |  |

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