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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Investment [Line Items] |  |
Cost | $ 377,895 | $ 365,905
Gross unrealized gains | 61,552 | 33,610
Gross unrealized losses | (6,040) | (17,882)
Fair value | 433,407 | 381,633
Common stocks |  |
Investment [Line Items] |  |
Cost | 695 | 790
Gross unrealized gains | 21 | 112
Gross unrealized losses | (459) | (375)
Fair value | 257 | 527
Exchange-traded funds |  |
Investment [Line Items] |  |
Cost | 213,909 | 213,420
Gross unrealized gains | 61,531 | 33,498
Gross unrealized losses | (2,171) | (10,079)
Fair value | 273,269 | 236,839
Bond mutual funds |  |
Investment [Line Items] |  |
Cost | 163,291 | 151,695
Gross unrealized gains | 0 | 0
Gross unrealized losses | (3,410) | (7,428)
Fair value | $ 159,881 | $ 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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