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STOCK-BASED COMPENSATION - Board of Directors Compensation - Additional Information (Details) - Director [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Restricted stock awards and units vesting terms     1 year  
Fair value of shares issued $ 444,000 $ 365,000 $ 883,000 $ 730,000
Shares issued (in shares) 15,000 15,000