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Operating Leases (Narrative) (Details)
$ in Thousands, Engine in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Engine
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Engine
Aircraft
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Lessee Lease Description [Line Items]          
Operating lease right-of-use assets, net $ 794,443   $ 794,443   $ 809,174
Lease liabilities, net 858,346   $ 858,346   $ 867,426
Number of aircraft engines | Aircraft     8    
Net book value of lease assets 35,200   $ 35,200    
Lease income $ 1,200 $ 8,600 $ 7,700 $ 18,200  
Minimum [Member] | Office Space and Office Equipment [Member]          
Lessee Lease Description [Line Items]          
Operating leases remaining lease term     1 year    
Maximum [Member] | Office Space and Office Equipment [Member]          
Lessee Lease Description [Line Items]          
Operating leases remaining lease term     14 years    
Other Income [Member] | Four Aircraft Engine [Member]          
Lessee Lease Description [Line Items]          
Number of engines sold | Engine 4        
Net book value $ 33,000   $ 33,000    
Gain loss on sale of aircraft engines 9,900        
Other Income [Member] | Ten Aircraft Engine [Member]          
Lessee Lease Description [Line Items]          
Number of engines sold | Engine     10    
Net book value $ 86,000   $ 86,000    
Gain loss on sale of aircraft engines     $ 41,900