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CORPORATE BORROWINGS - Narrative (Details) $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 16, 2021 USD ($) day | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) | Aug. 23, 2023 USD ($) | Aug. 22, 2023 USD ($) | May 14, 2021 USD ($) | Feb. 14, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized loan fees |  | $ 5,909 | $ 6,601 |  |  |  |  |  |  |
Borrowings |  | 125,000 | 105,000 | $ 0 |  |  |  |  |  |
Total indebtedness outstanding |  | 329,450 | 293,850 |  |  |  |  |  |  |
Note Purchase Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized loan fees |  | 52 |  |  |  |  |  |  |  |
Secured Debt | Note Purchase Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
New loan fees |  | 0 |  |  |  |  |  |  |  |
Term loan face amount |  |  |  |  |  |  |  | $ 20 |  |
Secured Debt | Series A Senior Secured Notes, 3.53% (fixed rate) due 2027 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total indebtedness outstanding |  | $ 8,800 | 12,000 |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 20,000 |  |  |  |
Senior secured notes, stated interest rate |  | 3.53% |  |  |  | 3.53% |  |  |  |
Secured Debt | Senior Secured Notes, 3.80% (fixed rate) due 2029 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total indebtedness outstanding |  | $ 14,400 | 17,600 |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  | $ 20,000 |  |  |  |  |
Senior secured notes, stated interest rate |  | 3.80% |  |  |  |  |  |  |  |
Convertible Debt | Convertible Note, 1.88% (fixed rate) due 2041 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
New loan fees |  | $ 0 |  |  |  |  |  |  |  |
Unamortized loan fees |  | 5,386 |  |  |  |  |  |  |  |
Total indebtedness outstanding |  | $ 201,250 | 201,250 |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 201,250 |  |  |  |  |  |  |  |  |
Senior secured notes, stated interest rate | 1.88% | 1.88% |  |  |  |  |  |  |  |
Conversion ratio | 0.0103911 |  |  |  |  |  |  |  |  |
Threshold of trading days | day | 20 |  |  |  |  |  |  |  |  |
Threshold of consecutive trading days | day | 30 |  |  |  |  |  |  |  |  |
Threshold percentage | 130.00% |  |  |  |  |  |  |  |  |
Threshold of business day | day | 5 |  |  |  |  |  |  |  |  |
Threshold period | day | 10 |  |  |  |  |  |  |  |  |
Measurement percentage | 0.98 |  |  |  |  |  |  |  |  |
Convertible Debt | Convertible Note, 1.88% (fixed rate) due 2041 | Initial Purchasers |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 26,250 |  |  |  |  |  |  |  |  |
Revolver | Line of Credit | Credit Agreement - Revolver, 5.52% (variable rate) due 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 400,000 | $ 300,000
Contingent increase in borrowing capacity |  |  |  |  |  |  |  |  | $ 100,000 |
New loan fees |  | $ 0 |  |  |  |  |  |  |  |
Unamortized loan fees |  | 471 |  |  |  |  |  |  |  |
Borrowings |  |  | 105,000 |  |  |  |  |  |  |
Total indebtedness outstanding |  | 105,000 | $ 63,000 |  |  |  |  |  |  |
Remaining borrowing capacity |  | $ 295,000 |  |  |  |  |  |  |  |
Credit agreement, interest rate |  | 5.52% |  |  |  |  |  |  |  |
Revolver | Secured Debt | Note Purchase Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  | $ 226,800 |  |  |  |  |  |  |  |
Term loan face amount |  |  |  |  |  |  | $ 250 | $ 105 |  |

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