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STOCK-BASED COMPENSATION - Other Information (Details) - Restricted Stock - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Stock-based compensation
Unrecognized compensation cost related to non-vested restricted shares	$ 8,428,000
Unrecognized compensation cost related to non-vested restricted shares recognized period	2 years 7 months 6 days
Tax benefits for compensation tax deductions in excess of compensation expense	$ 456,000	$ 583,000

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