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INVESTMENTS (Equity Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |
Cost | $ 376,493 | $ 365,905
Gross unrealized gains | 54,718 | 33,610
Gross unrealized losses | (12,348) | (17,882)
Fair value | 418,863 | 381,633
Common stocks |  |
Investment [Line Items] |  |
Cost | 693 | 790
Gross unrealized gains | 207 | 112
Gross unrealized losses | (315) | (375)
Fair value | 585 | 527
Exchange-traded funds |  |
Investment [Line Items] |  |
Cost | 221,337 | 213,420
Gross unrealized gains | 54,511 | 33,498
Gross unrealized losses | (4,240) | (10,079)
Fair value | 271,608 | 236,839
Bond mutual funds |  |
Investment [Line Items] |  |
Cost | 154,463 | 151,695
Gross unrealized gains | 0 | 0
Gross unrealized losses | (7,793) | (7,428)
Fair value | $ 146,670 | $ 144,267

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- Definition Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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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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- Definition Amount of unrealized loss on 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 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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