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Investment in Other Companies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) engine
Number of spare engines sold to Aero Engines | engine | 15
Aero Engines, LLC. |
Payments to acquire interest in joint venture | $ 22,300
Investment ownership (as a percent) | 75.00%
Number of spare engines purchased | engine | 15
Long-term debt | $ 0
Investment balance in Aero Engines | 25,500
Additional interest in Joint venture | 1,000
Company's portion of income generated by Aero Engines | $ 1,600

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