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PENSION AND POSTRETIREMENT WELFARE PLANS - Pension Plan Benefits and Components (Details) - Pension Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Benefits expected to be paid      
2016 $ 314    
2017 324    
2018 327    
2019 344    
2020 360    
2021-2025 2,099    
Components of net periodic expense      
Service cost 105 $ 83 $ 103
Interest cost 273 266 241
Amortization of net loss 195 43 172
Expected return on assets (329) (339) (288)
Net periodic pension expense $ 244 $ 53 $ 228
Amortization of cumulative gains and losses, threshold, as a percentage of the greater of the Market Related Value of Assets and the Projected Benefit Obligation 10.00%