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Long-term Investments - Carrying Value of Equity Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Total carrying value of the equity securities |  |
Initial cost basis | $ 689,724 | $ 662,460
Upward adjustments | 92,736 | 85,710
Downward adjustments | (579,719) | (554,013)
Impairment charges |  | 14,200
Foreign currency translation | (1,451) | 2,422
Total carrying value at the end of the period | 201,290 | $ 196,579
Online education company |  |
Total carrying value of the equity securities |  |
Impairment charges | $ 15,900 |

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