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DEBT OBLIGATIONS (Details) ¥ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 CNY (¥)	Dec. 31, 2020 USD ($)
DEBT OBLIGATIONS
Long-term debt	$ 119,882,000			$ 120,079,000
Unamortized debt issuance costs	(542,000)			(577,000)
Revolving Credit Facility
DEBT OBLIGATIONS
Long-term debt	$ 120,424,000			120,656,000
Effective rate (as a percent)	2.49%		2.49%
Amended Revolving Facility
DEBT OBLIGATIONS
Maximum borrowing capacity	$ 225,000,000
Available borrowing capacity	$ 75,000,000
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent)	0.20%
Unused amount of credit facility	$ 104,576
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)	0.225%
Amended Revolving Facility | LIBOR
DEBT OBLIGATIONS
Applicable margin (as a percent)	1.625%
Amended Revolving Facility | LIBOR | Minimum
DEBT OBLIGATIONS
Applicable margin (as a percent)	1.00%
Amended Revolving Facility | LIBOR | Maximum
DEBT OBLIGATIONS
Applicable margin (as a percent)	1.75%
Amended Revolving Facility | Prime Rate
DEBT OBLIGATIONS
Applicable margin (as a percent)	0.625%
Amended Revolving Facility | Prime Rate | Minimum
DEBT OBLIGATIONS
Applicable margin (as a percent)	0.00%
Amended Revolving Facility | Prime Rate | Maximum
DEBT OBLIGATIONS
Applicable margin (as a percent)	0.75%
China Credit Facility
DEBT OBLIGATIONS
Maximum borrowing capacity	$ 1,526,000		¥ 10,000
Average outstanding borrowings	0	$ 0
Principal amount of debt borrowed	$ 0			$ 0

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

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Face (par) amount of debt instrument at time of issuance.

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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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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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Average amount borrowed under the credit facility during the period.

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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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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 of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount after 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. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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