DEBT OBLIGATIONS (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2023	Dec. 31, 2022
DEBT OBLIGATIONS
Unamortized debt issuance costs	$ (400)	$ (625)
Finance lease obligations - noncurrent	8,712	9,019
Long-term debt	224,364	235,454
Revolving Credit Facility
DEBT OBLIGATIONS
Revolving Credit Facility, long-term	$ 216,052	$ 227,060
Effective rate (as a percent)	5.10%
Amended Revolving Facility
DEBT OBLIGATIONS
Maximum borrowing capacity	$ 280,000
Minimum interest coverage ratio	3.00%
Leverage ratio	4.00%
Increase in leverage ratio	0.50%
Unused amount of credit facility	$ 63,948
Amended Revolving Facility \| Minimum
DEBT OBLIGATIONS
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent)	0.10%
Amended Revolving Facility \| Maximum
DEBT OBLIGATIONS
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent)	0.275%
Amended Revolving Facility \| For quarter ending on or after December 31, 2023
DEBT OBLIGATIONS
Leverage ratio	3.50%
Amended Revolving Facility \| Base Rate
DEBT OBLIGATIONS
Applicable margin (as a percent)	0.00%
Amended Revolving Facility \| Adjusted SOFR
DEBT OBLIGATIONS
Applicable margin (as a percent)	1.625%
Amended Revolving Facility \| Adjusted SOFR \| Minimum
DEBT OBLIGATIONS
Applicable margin (as a percent)	1.00%
Amended Revolving Facility \| Adjusted SOFR \| Maximum
DEBT OBLIGATIONS
Applicable margin (as a percent)	2.25%

The increase in ratio of total debt obligation relative to the total assets or the equity contribution.

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The ratio of total debt obligation relative to the total assets or the equity contribution.

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Amount before unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer.

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The ratio of minimum interest coverage.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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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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No definition available.

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