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FINANCING ARRANGEMENTS AND LONG-TERM DEBT (Details)	Mar. 10, 2020 USD ($) installment	Jun. 30, 2020 USD ($)	Mar. 09, 2020 USD ($)	Dec. 31, 2019 USD ($)
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Outstanding borrowings		$ 80,900,000		$ 86,900,000
Fair value of outstanding borrowing		79,900,000		$ 86,700,000
Term loan facility
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Outstanding borrowings		$ 80,900,000
Effective interest rate (as a percent)		2.55%
Revolving facility
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Outstanding borrowings		$ 0.0
Effective interest rate (as a percent)		2.41%
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
Discount rate | Minimum
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Debt instrument, measurement input		0.0241		0.0241
Discount rate | Maximum
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Debt instrument, measurement input		0.0255		0.0255

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Represents the percentage of net proceeds from insurance recovery and condemnation events used for mandatory repayments of the debt.

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

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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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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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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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