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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale investments | $ 1,933,226 | $ 2,411,622
Trading investments | 53,262 | $ 54,481
Level 3 | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale investments | 2,689 |
Trading investments | 53,262 |
Total | $ 55,951 |
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.069 |
Measurement input | 0.069 |
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Default Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.040 |
Measurement input | 0.040 |
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.110 |
Measurement input | 0.110 |
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Default Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.170 |
Measurement input | 0.170 |
Level 3 | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.083 |
Measurement input | 0.083 |
Level 3 | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Default Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.115 |
Measurement input | 0.115 |

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