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DERIVATIVE INSTRUMENTS - Schedule of Derivatives Outstanding (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional		$ 190,971	$ 409,771
Fair value, asset	[1]	950	693
Fair value, liability		0	0
1 Month LIBOR
Derivative [Line Items]
Notional		69,571	69,571
Fair value, asset		0	0
Fair value, liability		$ 0	$ 0
Remaining maturity		1 month 9 days	4 months 9 days
5-year Swap
Derivative [Line Items]
Notional		$ 24,400	$ 46,000
Fair value, asset		191	158
Fair value, liability		$ 0	$ 0
Remaining maturity		3 months	3 months
10-year Swap
Derivative [Line Items]
Notional		$ 76,700	$ 149,800
Fair value, asset		600	516
Fair value, liability		$ 0	$ 0
Remaining maturity		3 months	3 months
5-year U.S. Treasury Note
Derivative [Line Items]
Notional		$ 20,300	$ 1,100
Fair value, asset		159	4
Fair value, liability		$ 0	$ 0
Remaining maturity		3 months	3 months
Futures
Derivative [Line Items]
Notional		$ 121,400	$ 196,900
Fair value, asset		950	678
Fair value, liability		$ 0	0
S&P 500 Put Options
Derivative [Line Items]
Notional			143,300
Fair value, asset			15
Fair value, liability			$ 0
Remaining maturity			18 days
Credit Derivatives
Derivative [Line Items]
Notional			$ 143,300
Fair value, asset			15
Fair value, liability			$ 0
[1] Includes amounts relating to consolidated variable interest entities. See Note 1.

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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.

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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.

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Nominal or face amount used to calculate payment on derivative.

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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.

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