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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 |  |

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- Definition Amount, after accumulated depreciation, of long-lived, depreciable flight asset owned and right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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