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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 518,090 | $ 543,833
Gross unrealized gains | 130,385 | 110,296
Gross unrealized losses | (43,641) | (65,618)
Fair value | 604,834 | 588,511
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 2,843 | 2,843
Gross unrealized gains | 76 | 101
Gross unrealized losses | (418) | (398)
Fair value | 2,501 | 2,546
Preferred stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 5,843 | 5,496
Gross unrealized gains | 341 | 218
Gross unrealized losses | (100) | (113)
Fair value | 6,084 | 5,601
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 188,625 | 182,989
Gross unrealized gains | 125,072 | 105,858
Gross unrealized losses | (473) | (1,572)
Fair value | 313,224 | 287,275
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 320,779 | 352,505
Gross unrealized gains | 4,896 | 4,119
Gross unrealized losses | (42,650) | (63,535)
Fair value | $ 283,025 | $ 293,089

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