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Investments - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
engine
aircraft.
aircraft
Sep. 30, 2022
USD ($)
aircraft.
Dec. 31, 2022
USD ($)
Equipment held for operating lease          
Schedule of Equity Method Investments [Line Items]          
Net book value $ 2,170,980   $ 2,170,980   $ 2,111,935
WMES          
Schedule of Equity Method Investments [Line Items]          
Ownership interest 50.00%   50.00%    
Number of engines in lease portfolio | engine     35    
Number of aircraft in lease portfolio | aircraft     4    
Proceeds from sale of assets     $ 22,300    
Purchases from related party     15,500    
WMES | Other Income | Asset Management          
Schedule of Equity Method Investments [Line Items]          
Other sales and revenue $ 800 $ 400 1,900 $ 1,400  
WMES | Aircraft          
Schedule of Equity Method Investments [Line Items]          
Net book value $ 221,600   $ 221,600    
CASC Willis          
Schedule of Equity Method Investments [Line Items]          
Ownership interest 50.00%   50.00%    
Number of engines in lease portfolio | engine     4    
CASC Willis | Equipment held for operating lease          
Schedule of Equity Method Investments [Line Items]          
Net book value $ 39,900   $ 39,900    
WMES and CASC Willis          
Schedule of Equity Method Investments [Line Items]          
Number of aircraft sales | aircraft.     0 0