Operating Leases (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) Engine Aircraft	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, net	$ 786,314		$ 809,174
Lease liabilities, net	$ 844,309		$ 867,426
Number of aircraft engines | Aircraft	17
Net book value of lease assets	$ 110,300
Lease income	$ 3,900	$ 1,900
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	15 years
Other Income [Member] | One Aircraft Engine [Member]
Lessee Lease Description [Line Items]
Number of engines sold | Engine	1
Net book value	$ 11,000
Gain loss on sale of aircraft engines	$ 3,600