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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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