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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.

X

- 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

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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
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-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

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities 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 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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- Definition

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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

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