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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 564,965 | $ 494,356
Gross unrealized gains | 103,717 | 68,694
Gross unrealized losses | (71,990) | (77,797)
Fair value | $ 596,692 | 485,253
Limited partnership |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage of investment composition (as a percent) | 73.00% |
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 3,130 | 7,279
Gross unrealized gains | 322 | 636
Gross unrealized losses | (406) | (442)
Fair value | 3,046 | 7,473
Preferred stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 5,115 | 115
Gross unrealized gains | 0 | 0
Gross unrealized losses | (131) | (43)
Fair value | 4,984 | 72
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 198,244 | 207,505
Gross unrealized gains | 103,126 | 68,058
Gross unrealized losses | (2,205) | (5,757)
Fair value | 299,165 | 269,806
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 358,476 | 279,457
Gross unrealized gains | 269 | 0
Gross unrealized losses | (69,248) | (71,555)
Fair value | $ 289,497 | $ 207,902

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