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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, age of eligibility 21 years    
Defined contribution plan, required service period prior to plan participation 60 days    
Defined contribution plan, employer matching contribution 50.00%    
Defined contribution plan, maximum annual contribution per employee 2.50%    
Defined contribution plan, employer discretionary contribution amount $ 1,034 $ 987 $ 997
Deferred compensation arrangement with individual, interest rate on notes payable 5.00%    
Deferred compensation arrangement with individual, notes payable plus accrued interest   $ 122  
Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Deferred compensation arrangement with individual, requisite service period 5 years    
Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Deferred compensation arrangement with individual, requisite service period 10 years