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Corporate Borrowings - Narrative (Details) - USD ($) $ in Thousands | Nov. 16, 2021 | Sep. 30, 2025 | Apr. 24, 2025 | Dec. 31, 2024 | Aug. 23, 2023 | Aug. 22, 2023 | Feb. 14, 2020 | Dec. 31, 2019 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total indebtedness outstanding |  | $ 276,650 |  | $ 329,450 |  |  |  |  |
Convertible Senior Notes, 1.88% (fixed rate) due 2041 | Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total indebtedness outstanding |  | $ 201,250 |  | 201,250 |  |  |  |  |
Proceeds from issuance of debt | $ 201,250 |  |  |  |  |  |  |  |
Stated interest rate | 1.88% | 1.88% |  |  |  |  |  |  |
Note Purchase Agreement | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum face amount of notes |  |  |  |  | $ 250,000 |  |  |  |
Remaining face amount of notes |  | $ 231,600 |  |  |  |  |  |  |
Series A Senior Secured Notes | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum face amount of notes |  |  |  |  |  | $ 20,000 |  |  |
Series A Senior Secured Notes, 3.53% (fixed rate) due 2027 | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total indebtedness outstanding |  | $ 6,400 |  | 8,800 |  |  |  |  |
Stated interest rate |  | 3.53% |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  |  | $ 20,000
Senior Secured Notes | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum face amount of notes |  |  |  |  |  | $ 105,000 |  |  |
Senior Secured Notes, 3.80% (fixed rate) due 2029 | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total indebtedness outstanding |  | $ 12,000 |  | 14,400 |  |  |  |  |
Stated interest rate |  | 3.80% |  |  |  |  |  |  |
Face amount of notes |  |  |  |  |  |  |  | $ 20,000 |
Revolving Credit Facility | Credit Agreement - Revolver, 5.26% (variable rate) due 2030 | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 500,000 |  |  |  | $ 300,000 |  |
Contingent increase in borrowing capacity |  |  | 200,000 |  |  |  |  |  |
Loan fees |  |  | $ 2,712 |  |  |  |  |  |
Total indebtedness outstanding |  | $ 57,000 |  | $ 105,000 |  |  |  |  |
Remaining borrowing capacity |  | $ 443,000 |  |  |  |  |  |  |

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