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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Accumulated postretirement benefit obligation $ (1,076) $ (1,174)  
Fair value of plan assets 0 0 $ 0
Funded status (1,076) (1,174)  
Net amount recognized in consolidated balance sheet (after ASC 715) (included in other long-term obligations) $ 1,076 $ 1,174