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EMPLOYEE BENEFIT PLANS - Post-retirement Plan (Details) - Postretirement Benefits - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net prior service cost (credit) $ 1,659 $ 1,742
Net actuarial (gain) loss (126) (257)
Total recognized in accumulated other comprehensive income $ 1,533 $ 1,485