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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Consolidated Balance Sheet (Details) - Other Liabilities - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Pension Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Liability, Defined Benefit Plan $ 49 $ 147
Postretirement Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Liability, Defined Benefit Plan $ 4,039 $ 3,422