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Fixed Assets (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) Engine | Dec. 31, 2024 USD ($) Engine Aircraft | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization |  | $ 62,398 | $ 60,533 | $ 50,615
Number of aircraft engines | Aircraft |  | 18 |  |
Net book value of lease assets |  | $ 121,300 |  |
Lease income |  | $ 25,300 |  |
Other Income [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of engines sold | Engine |  | 11 |  |
Net book value |  | $ 59,400 |  |
11 Aircraft Engines [Member] | Other Income [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gain loss on sale of aircraft engines |  | $ 46,500 |  |
Other Assets [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of engines sold | Engine | 22 |  |  |
Net book value | $ 152,100 |  |  |

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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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