EMPLOYEE BENEFIT PLAN (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) Plan	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | Plan	2
Defined Benefit Plan, Type [Extensible List]	us-gaap:DefinedBenefitPostretirementHealthCoverageMember
Defined Benefit Plan, Funding Status [Extensible List]	us-gaap:UnfundedPlanMember
Amount recognized in consolidated balance sheet for benefit obligations (included in other long-term obligations)	$ 1,496		$ 1,411
Components of net periodic benefit cost [Abstract]
Service cost	50	$ 48
Interest cost	35	33
Amortization of prior service cost	55	40
Amortization of gain	(11)	(8)
Net periodic benefit cost	129	$ 113
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Historical cash payments for retirement medical plan claims per year	$ 100