LONG-TERM DEBT - Detail of Convertible Debt Carrying Amount (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Principal	$ 501,495
Convertible debt embedded derivative \| ASU 2020-06 (ASC 470-20)
Debt Instrument [Line Items]
Carrying amount of the equity component, net of issuance costs		$ 7,969
Convertible debt embedded derivative \| ASU 2016-06 (ASC 815-15)
Debt Instrument [Line Items]
Carrying amount of the equity component, net of issuance costs	37,276	37,276
Convertible debt
Debt Instrument [Line Items]
Principal	95,209	93,130
Unamortized issuance costs	(1,435)	(916)
Unamortized discount	(2,289)	(4,552)
Net carrying amount of the liability component	$ 91,485	$ 87,662

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Amount, after accumulated amortization, of debt discount.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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