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EMPLOYEE BENEFIT PLANS, Defined Contribution Plan (Details) - USD ($) | 12 Months Ended
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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