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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI Components (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Details about AOCI Components |  |
Investment income | $ (3,673) | $ (595)
Reclassification Out Of Accumulated Other Comprehensive Income (Loss) |  |
Details about AOCI Components |  |
Investment income | 24 | (2)
Unrealized Gain (Loss) on Securities | Reclassification Out Of Accumulated Other Comprehensive Income (Loss) |  |
Details about AOCI Components |  |
Investment income | $ 24 | $ (2)

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Line items represent financial 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 No definition available. + Details
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