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VARIABLE INTEREST ENTITIES - Information Regarding Activity in Alternative Energy Partnerships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Gain (loss) on investments in alternative energy partnerships	$ (4,888)	$ (5,214)	$ (5,044)
Tax expense (benefit) recognized from HLBV application	1,786	4,219	4,844
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Fundings	3,631	806	0
Cash distribution from investment	2,094	2,025	13,767
Gain (loss) on investments in alternative energy partnerships	365	(1,694)	5,044
Tax expense (benefit) recognized from HLBV application	45	(362)	1,023
Income tax credits recognized	$ 0	$ 3,446	$ 9,647

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