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INVESTMENTS - Net Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gross realized investment gains |  |  |  |  |  |  |  |  |  |  |
Fixed maturities and short-term investments |  |  |  |  |  |  |  |  | $ 46,067 | $ 72,046 | $ 86,267
Equity securities |  |  |  |  |  |  |  |  | 20,435 | 78,343 | 19,104
Gross realized investment gains |  |  |  |  |  |  |  |  | 66,502 | 150,389 | 105,371
Gross realized investment losses |  |  |  |  |  |  |  |  |  |  |
Fixed maturities and short-term investments |  |  |  |  |  |  |  |  | (142,153) | (98,442) | (134,460)
Equity securities |  |  |  |  |  |  |  |  | (3,389) | (959) | (16,155)
Gross realized investment losses |  |  |  |  |  |  |  |  | (145,542) | (99,401) | (150,615)
Net OTTI charge recognized in net income |  |  |  |  |  |  |  |  | (9,733) | (14,493) | (26,210)
Change in fair value of investment derivatives |  |  |  |  |  |  |  |  | 5,445 | (8,269) | 10,929
Change in fair value of equity securities |  |  |  |  |  |  |  |  | (66,890) | 0 | 0
Total net investment gains (losses) | $ (72,667) | $ (17,628) | $ (45,093) | $ (14,830) | $ 43,038 | $ 14,632 | $ (4,392) | $ (25,050) | $ (150,218) | $ 28,226 | $ (60,525)

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities, the change in fair value of investment-related derivatives not designated as hedges and any hedge ineffectiveness recognized in earnings in relation to investment portfolio-related fair value hedges. + References No definition available. + Details
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- Definition Amount of realized gain on investment in debt and equity securities. + References No definition available. + Details
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- Definition Debt and Equity Securities, Realized Gain [Abstract] + References No definition available. + Details
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- Definition Amount of realized loss on investment in debt and equity securities. + References No definition available. + Details
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- Definition Debt and Equity Securities, Realized Loss [Abstract] + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio. + References No definition available. + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of realized gain from sale 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 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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- Definition Amount of realized loss from sale 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 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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- Definition Amount of unrealized gain (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/2009/role/commonPracticeRef -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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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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