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FINANCING ARRANGEMENTS AND LONG-TERM DEBT - Narrative (Details)	Mar. 10, 2020 USD ($) installment	Dec. 31, 2020 USD ($)	Mar. 09, 2020 USD ($)	Dec. 31, 2019 USD ($)
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Outstanding borrowings		$ 78,775,000		$ 86,863,000
Effective interest rate (as a percent)		2.50%		5.20%
Fair value of outstanding borrowing		$ 77,700,000		$ 86,700,000
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FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Debt instrument, measurement input		2.39
Maximum
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Debt instrument, measurement input		2.49
Eurodollar Rate
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Interest rate basis	Eurodollar Rate
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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