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Other assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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