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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Consolidated Balance Sheet (Details) - Other Liabilities - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Pension Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined benefit plans, liabilities $ 1,005 $ 1,374
Postretirement Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined benefit plans, liabilities $ 3,249 $ 3,039