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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 454,451 | $ 421,744
Gross unrealized gains | 94,002 | 97,648
Gross unrealized losses | (777) | (947)
Fair value | $ 547,676 | 518,445
Limited partnership |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage of investment composition | 64.00% |
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 8,470 | 10,810
Gross unrealized gains | 1,682 | 689
Gross unrealized losses | (435) | (557)
Fair value | 9,717 | 10,942
Preferred shares |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 5,519 | 6,301
Gross unrealized gains | 1,430 | 1,767
Gross unrealized losses | 0 | 0
Fair value | 6,949 | 8,068
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 182,544 | 147,794
Gross unrealized gains | 87,184 | 74,314
Gross unrealized losses | (342) | (390)
Fair value | 269,386 | 221,718
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 257,918 | 256,839
Gross unrealized gains | 3,706 | 20,878
Gross unrealized losses | 0 | 0
Fair value | $ 261,624 | $ 277,717

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