Operating Leases (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) Aircraft	Dec. 31, 2023 USD ($)
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, net	$ 804,130	$ 778,216
Operating lease liabilities	$ 854,616	$ 825,529
Number of aircraft engines | Aircraft	17
Net book value of lease assets	$ 114,500
Lease income	$ 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	12 years