PENSION AND POSTRETIREMENT WELFARE PLANS - Additional Information (Details) - Postretirement Welfare Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension and Postretirement plan
Net periodic postretirement benefit (income) expense	$ (24)	$ (24)	$ 30
Amount of accumulated other comprehensive income expected to be recognized as a plan expense in next fiscal year
Amount of accumulated other comprehensive income expected to be recognized as a plan expense	127
Actuarial gain	115
Prior service credit	$ 12
Weighted average discount rate used in determining the accumulated postretirement benefit obligation
Discount rate (as a percent)	4.25%	4.00%	4.75%
Weighted average discount rate used to determine the net periodic postretirement benefit cost
Discount rate (as a percent)	4.25%	4.75%	4.00%
Benefits expected to be paid
2016	$ 56
2017	51
2018	49
2019	59
2020	356
2021-2025	$ 341