Operating Leases (Narrative) (Details) $ in Thousands, Engine in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) Engine	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Engine Aircraft	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, net	$ 814,952		$ 814,952		$ 809,174
Lease liabilities, net	876,872		$ 876,872		$ 867,426
Number of aircraft engines | Aircraft			12
Net book value of lease assets	68,200		$ 68,200
Lease income	$ 2,600	$ 7,700	$ 6,500	$ 9,600
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] | Five Aircraft Engine [Member]
Lessee Lease Description [Line Items]
Number of engines sold | Engine	5
Net book value	$ 42,100		$ 42,100
Gain loss on sale of aircraft engines	28,500
Other Income [Member] | Six Aircraft Engine [Member]
Lessee Lease Description [Line Items]
Number of engines sold | Engine			6
Net book value	$ 53,100		$ 53,100
Gain loss on sale of aircraft engines			$ 32,100