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Other assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable, net of allowance for credit losses (a) (b) | $ 517,302 | $ 529,172
Straight-line rents, prepaid expenses and other | 206,807 | 125,541
Lease incentives | 163,100 | 177,028
Debt issuance costs | 144,414 | 20,722
Investments | 129,512 | 138,065
Operating lease right of use assets | 35,110 | 40,603
Other tangible fixed assets | 21,105 | 22,512
Derivative assets (Note 9) | 10,383 | 3,303
Other receivables | 374,932 | 172,488
Other assets | $ 1,602,665 | $ 1,229,434
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets | Other assets
Allowance for credit losses on notes receivable | $ 28,000 | $ 7,000
Financing receivable, restructuring claims | 186,000 |
Citi Term Loan | Line of Credit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Debt issuance costs | 130,000 |
Deferral Agreements |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable, net of allowance for credit losses (a) (b) | 463,000 | 490,000
Aircraft Sale Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable, net of allowance for credit losses (a) (b) | $ 54,000 | $ 39,000

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