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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 472,214 | $ 421,744
Gross unrealized gains | 116,767 | 97,648
Gross unrealized losses | (785) | (947)
Fair value | $ 588,196 | 518,445
Limited partnership |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage of investment composition | 68.00% |
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 943 | 10,810
Gross unrealized gains | 424 | 689
Gross unrealized losses | (415) | (557)
Fair value | 952 | 10,942
Preferred shares |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 115 | 6,301
Gross unrealized gains | 136 | 1,767
Gross unrealized losses | 0 | 0
Fair value | 251 | 8,068
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 203,336 | 147,794
Gross unrealized gains | 107,019 | 74,314
Gross unrealized losses | (370) | (390)
Fair value | 309,985 | 221,718
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 267,820 | 256,839
Gross unrealized gains | 9,188 | 20,878
Gross unrealized losses | 0 | 0
Fair value | $ 277,008 | $ 277,717

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