INCOME TAXES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Investment tax credit, solar property, percentage				26.00%		30.00%
Deferred employer portion of OASDI	$ 5,100				$ 3,100
Deferred tax assets, operating loss carryforwards, domestic, refundable and receivables					22,800
Federal net operating losses	0				24,091
Tax credit carryforward	$ 224,200				195,200
Net operating losses, life	20 years
Valuation allowance	$ 23,613				17,639
Capital Loss Carryforward
Income Tax Contingency [Line Items]
Potential net capital loss	61,800
Valuation allowance	23,600
Operating loss carryforward, valuation allowance	17,300
Tax credit carryforward, valuation allowance	6,400
Forecast
Income Tax Contingency [Line Items]
Investment tax credit, solar property, percentage		10.00%	22.00%
Domestic Tax Authority
Income Tax Contingency [Line Items]
Net operating losses					134,000
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Net operating losses	$ 554,600				$ 487,700
State and Local Jurisdiction | Minimum
Income Tax Contingency [Line Items]
Net operating losses, life	7 years
State and Local Jurisdiction | Maximum
Income Tax Contingency [Line Items]
Net operating losses, life	20 years