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DERIVATIVE INSTRUMENTS - Schedule of Derivatives Outstanding (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Notional |  | $ 454,571,000 | $ 578,971,000
Fair value, asset | [1] | 1,632,000 | 0
Fair value, liability | [1] | 0 | 975,000
1 Month LIBOR |  |  |
Derivative [Line Items] |  |  |
Notional |  | 69,571,000 | 69,571,000
Fair value, asset |  | 0 | 0
Fair value, liability |  | $ 0 | $ 0
Remaining maturity |  | 1 year 1 month 9 days | 1 year 4 months 6 days
Futures |  |  |
Derivative [Line Items] |  |  |
Notional |  | $ 385,000,000 | $ 509,400,000
Fair value, asset |  | 1,582,000 | 0
Fair value, liability |  | 0 | 975,000
5-year Swap |  |  |
Derivative [Line Items] |  |  |
Notional |  | 188,400,000 | 274,900,000
Fair value, asset |  | 774,000 | 0
Fair value, liability |  | $ 0 | $ 526,000
Remaining maturity |  | 3 months | 3 months
10-year Swap |  |  |
Derivative [Line Items] |  |  |
Notional |  | $ 189,800,000 | $ 227,700,000
Fair value, asset |  | 780,000 | 0
Fair value, liability |  | $ 0 | $ 436,000
Remaining maturity |  | 3 months | 3 months
5-year U.S. Treasury Note |  |  |
Derivative [Line Items] |  |  |
Notional |  | $ 6,800,000 | $ 6,800,000
Fair value, asset |  | 28,000 | 0
Fair value, liability |  | $ 0 | $ 13,000
Remaining maturity |  | 3 months | 3 months
Credit Risk Contract VIX |  |  |
Derivative [Line Items] |  |  |
Notional |  | $ 300 |
Fair value, asset |  | 50,000 |
Fair value, liability |  | $ 0 |
Remaining maturity |  | 1 month 17 days |
Credit Derivatives |  |  |
Derivative [Line Items] |  |  |
Notional |  | $ 0 |
Fair value, asset |  | 50,000 |
Fair value, liability |  | $ 0 |
[1] | Includes amounts relating to consolidated variable interest entities. See Note 3.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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