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INVESTMENTS INVESTMENTS - Additional Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017
Gain (Loss) on Investments [Line Items] |  |  |
NumberOfSecuritiesInSecurityPortfolio | 774 |  | 775
NumberOfSecuritiesInUnrealizedLossPosition | 359 |  | 237
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $ 0.0 | $ 22.2 |
Available-for-sale Securities, Gross Realized Gains |  | $ 0.5 |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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