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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Amortization of defined benefit pension items Prior service cost [1] $ (63) $ (262)
Amortization of defined benefit pension items Actuarial losses [1] 589 1,789
Amortization of defined benefit pension items Total before tax 526 1,527
Amortization of defined benefit pension items Tax benefit (137) (596)
Amortization of defined benefit pension items Net of tax $ 389 $ 931
[1] These amounts were included in the computation of net pension expense. See Note 11 for additional details.