Investment in Other Companies (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) engine
Number of spare engines purchased \| engine		15
Long-term debt	$ 2,902,192	$ 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	24,300
Company's portion of income generated by Aero Engines	$ 400

Number of spare engines purchased.

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Number of spare engines sold to joint venture.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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