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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 519,926 | $ 528,864
Gross unrealized gains | 57,133 | 135,230
Gross unrealized losses | (107,220) | (8,419)
Fair value | $ 469,839 | 655,675
Limited partnership |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage of investment composition (as a percent) | 70.00% |
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 13,655 | 1,264
Gross unrealized gains | 350 | 585
Gross unrealized losses | (2,718) | (485)
Fair value | 11,287 | 1,364
Preferred stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 115 | 115
Gross unrealized gains | 0 | 64
Gross unrealized losses | (43) | 0
Fair value | 72 | 179
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 227,847 | 203,455
Gross unrealized gains | 56,783 | 134,037
Gross unrealized losses | (14,050) | (677)
Fair value | 270,580 | 336,815
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 278,309 | 324,030
Gross unrealized gains | 0 | 544
Gross unrealized losses | (90,409) | (7,257)
Fair value | $ 187,900 | $ 317,317

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