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FINANCING ARRANGEMENTS AND LONG-TERM DEBT (Details)	Mar. 10, 2020 USD ($) installment	Sep. 30, 2020 USD ($)	Mar. 09, 2020 USD ($)	Dec. 31, 2019 USD ($)
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Outstanding borrowings		$ 79,900,000		$ 86,900,000
Fair value of outstanding borrowing		$ 78,800,000		$ 86,700,000
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Eurodollar Rate
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Interest rate basis	Eurodollar Rate
Term loan facility
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Outstanding borrowings		$ 79,900,000
Effective interest rate (as a percent)		2.48%
Revolving facility
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Outstanding borrowings		$ 0.0
Effective interest rate (as a percent)		2.40%
2020 Credit Agreement
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Percentage of proceeds from asset sales used for mandatory repayments of the debt	100.00%
Percentage of net proceeds from issuances of debt and equity used for mandatory repayments of the debt	100.00%
Percentage of net proceeds from insurance recovery and condemnation events used for mandatory repayments of the debt	100.00%
2020 Credit Agreement | Federal Funds Rate
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Applicable margin (as a percent)	0.50%
2020 Credit Agreement | Eurodollar Rate
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Applicable margin (as a percent)	1.00%
2020 Credit Agreement | Term loan facility
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Maximum borrowing capacity	$ 86,000,000.0
Number of quarterly installments | installment	19
Periodic repayment	$ 1,075,000
2020 Credit Agreement | Revolving facility
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Maximum borrowing capacity	$ 54,000,000.0		$ 30,000,000.0

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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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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