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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 380,645 | $ 365,905
Gross unrealized gains | 61,876 | 33,610
Gross unrealized losses | (12,618) | (17,882)
Fair value | 429,903 | 381,633
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 504 | 790
Gross unrealized gains | 67 | 112
Gross unrealized losses | (387) | (375)
Fair value | 184 | 527
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 215,620 | 213,420
Gross unrealized gains | 61,809 | 33,498
Gross unrealized losses | (3,707) | (10,079)
Fair value | 273,722 | 236,839
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 164,521 | 151,695
Gross unrealized gains | 0 | 0
Gross unrealized losses | (8,524) | (7,428)
Fair value | $ 155,997 | $ 144,267

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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