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STOCK-BASED COMPENSATION - Other Information (Details) - Restricted shares of common stock - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Stock-based compensation
Unrecognized compensation cost related to non-vested restricted shares	$ 8,415,000
Unrecognized compensation cost related to non-vested restricted shares recognized period	3 years 7 months 6 days
Tax benefits for compensation tax deductions in excess of compensation expense	$ 323,000	$ 345,000

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