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INVESTMENTS - Equity securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 365,905 | $ 552,867
Gross unrealized gains | 33,610 | 84,527
Gross unrealized losses | (17,882) | (1,883)
Fair value | 381,633 | 635,511
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 790 | 22,836
Gross unrealized gains | 112 | 3,412
Gross unrealized losses | (375) | (590)
Fair value | 527 | 25,658
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 213,420 | 356,252
Gross unrealized gains | 33,498 | 71,675
Gross unrealized losses | (10,079) | (294)
Fair value | 236,839 | 427,633
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 151,695 | 173,779
Gross unrealized gains | 0 | 9,440
Gross unrealized losses | (7,428) | (999)
Fair value | $ 144,267 | $ 182,220

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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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