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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts recognized in consolidated balance sheet [Abstract]      
Accumulated postretirement benefit obligation $ (1,573) $ (1,411)  
Fair value of plan assets 0 0 $ 0
Funded status (1,573) (1,411)  
Unrecognized prior service cost  
Unrecognized net (gain)/loss  
Net amount recognized in consolidated balance sheet (after ASC 715) (included in other long-term obligations) 1,573 1,411  
Accrued postretirement benefit cost (included in other long-term obligations)