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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 559,293 | $ 494,356
Gross unrealized gains | 83,894 | 68,694
Gross unrealized losses | (69,271) | (77,797)
Fair value | $ 573,916 | 485,253
Limited partnership |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage of investment composition (as a percent) | 71.00% |
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 3,130 | 7,279
Gross unrealized gains | 321 | 636
Gross unrealized losses | (437) | (442)
Fair value | 3,014 | 7,473
Preferred stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 115 | 115
Gross unrealized gains | 0 | 0
Gross unrealized losses | (113) | (43)
Fair value | 2 | 72
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 199,212 | 207,505
Gross unrealized gains | 83,523 | 68,058
Gross unrealized losses | (3,016) | (5,757)
Fair value | 279,719 | 269,806
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 356,836 | 279,457
Gross unrealized gains | 50 | 0
Gross unrealized losses | (65,705) | (71,555)
Fair value | $ 291,181 | $ 207,902

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