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Other assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other Assets [Abstract] |  |
Notes receivable, net of allowance for credit losses (a) (b) | $ 529,172 | $ 87,745
Lease incentives | 177,028 | 239,607
Investments (Note 9) | 138,065 | 123,279
Straight-line rents, prepaid expenses and other | 125,541 | 98,443
Operating lease ROU assets (Note 15) | 40,603 | 43,668
Other tangible fixed assets | 22,512 | 26,018
Debt issuance costs | 20,722 | 26,393
Derivative assets | 3,303 | 11,664
Other receivables | 172,488 | 358,659
Other assets | $ 1,229,434 | $ 1,015,476
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssets | us-gaap:OtherAssets
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable, net of allowance for credit losses | $ 529,172 | $ 87,745
Financing receivable, allowance for credit loss | 7,000 | 0
Deferral Agreements |  |
Other Assets [Abstract] |  |
Notes receivable, net of allowance for credit losses (a) (b) | 490,000 | 49,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable, net of allowance for credit losses | 490,000 | 49,000
Aircraft Sale Receivable |  |
Other Assets [Abstract] |  |
Notes receivable, net of allowance for credit losses (a) (b) | 39,000 | 39,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable, net of allowance for credit losses | $ 39,000 | $ 39,000

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