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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 340,510 | $ 398,956
Gross unrealized gains | 40,874 | 81,521
Gross unrealized losses | (2,524) | (6,270)
Fair value | $ 378,860 | 474,207
Limited partnership |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage of investment composition | 58.00% |
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 422 | 504
Gross unrealized gains | 13 | 77
Gross unrealized losses | (371) | (388)
Fair value | 64 | 193
Preferred shares |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 6,249 | 0
Gross unrealized gains | 1,183 | 0
Gross unrealized losses | (1) | 0
Fair value | 7,431 | 0
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 141,748 | 215,986
Gross unrealized gains | 37,825 | 81,444
Gross unrealized losses | (2,152) | (105)
Fair value | 177,421 | 297,325
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 192,091 | 182,466
Gross unrealized gains | 1,853 | 0
Gross unrealized losses | 0 | (5,777)
Fair value | $ 193,944 | $ 176,689

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