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Equity and Other Investments and Fair Value Measurements - Reconciliation of Equity and Long-Term Investments Balances (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value Disclosures [Abstract] |  |  |  |
Purchases of trading securities | $ 50,226 |  | $ 67,798 |
Purchases of equity and long-term investments |  |  | 1,218 |
Changes in fair value, net | (60,827) | $ (4,887) | 11,129 |
Other | 338 |  | 428 |
Equity and long-term investments | $ 434,169 |  | $ 444,432 | $ 363,859

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