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EMPLOYEE BENEFIT PLANS - Funded status of Retirement Income Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CHANGE IN PLAN ASSETS:      
Funded status at end of year $ 0 $ (51)  
Retirement Income Plan      
Defined Benefit Plan Disclosure [Line Items]      
ACCUMULATED BENEFIT OBLIGATION, END OF YEAR 6,379 6,083  
CHANGE IN PROJECTED BENEFIT OBLIGATION:      
Benefit obligation at beginning of year 6,083 5,703  
Service cost 0 0 $ 0
Interest cost 266 274 259
Actuarial loss (gain) 273 342  
Benefits paid (243) (236)  
Projected benefit obligation at end of year 6,379 6,083 5,703
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 6,032 5,813  
Actual return on plan assets 933 275  
Employer contributions 0 180  
Benefits paid (243) (236)  
Fair value of plan assets at end of year 6,722 6,032 5,813
Funded status at end of year 343 (51)  
AMOUNTS RECOGNIZED IN THE CONSOLIDATED BALANCE SHEETS CONSIST OF:      
Noncurrent assets 343 0  
Current liabilities 0 0  
Noncurrent liabilities 0 (51)  
Amounts recognized in balance sheet, Total 343 (51)  
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS CONSIST OF:      
Net loss 2,997 3,335  
Prior service cost (credit) 0 0  
Net transition obligation (asset) 0 0 $ 0
Amounts recognized in other comprehensive income before tax, Total $ 2,997 $ 3,335