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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 547,443 | $ 543,833
Gross unrealized gains | 111,412 | 110,296
Gross unrealized losses | (68,956) | (65,618)
Fair value | 589,899 | 588,511
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 2,843 | 2,843
Gross unrealized gains | 75 | 101
Gross unrealized losses | (423) | (398)
Fair value | 2,495 | 2,546
Preferred stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 5,810 | 5,496
Gross unrealized gains | 144 | 218
Gross unrealized losses | (112) | (113)
Fair value | 5,842 | 5,601
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 188,625 | 182,989
Gross unrealized gains | 109,531 | 105,858
Gross unrealized losses | (965) | (1,572)
Fair value | 297,191 | 287,275
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 350,165 | 352,505
Gross unrealized gains | 1,662 | 4,119
Gross unrealized losses | (67,456) | (63,535)
Fair value | $ 284,371 | $ 293,089

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