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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 356,176 | $ 398,956
Gross unrealized gains | 64,595 | 81,521
Gross unrealized losses | (2,885) | (6,270)
Fair value | $ 417,886 | 474,207
Limited partnership |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage of investment composition | 62.00% |
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 10,679 | 504
Gross unrealized gains | 35 | 77
Gross unrealized losses | (1,419) | (388)
Fair value | 9,295 | 193
Preferred shares |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 6,249 | 0
Gross unrealized gains | 1,505 | 0
Gross unrealized losses | 0 | 0
Fair value | 7,754 | 0
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 141,748 | 215,986
Gross unrealized gains | 51,920 | 81,444
Gross unrealized losses | (1,466) | (105)
Fair value | 192,202 | 297,325
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 197,500 | 182,466
Gross unrealized gains | 11,135 | 0
Gross unrealized losses | 0 | (5,777)
Fair value | $ 208,635 | $ 176,689

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