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EMPLOYEE BENEFIT PLANS, Defined Contribution Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
EMPLOYEE BENEFIT PLANS [Abstract]
Employer contribution to 401 (k) defined contribution plan	$ 388,000	$ 351,000	$ 285,000

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- References

No definition available.

+ Details

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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No definition available.

+ Details

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