EMPLOYEE BENEFIT PLAN (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) Plan	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amount recognized in consolidated balance sheet for benefit obligations (included in other long-term obligations)	$ 1,468		$ 1,411
Components of net periodic benefit cost [Abstract]
Service cost	34	$ 31
Interest cost	23	20
Amortization of prior service cost	37	24
Amortization of gain	(7)	(5)
Net periodic benefit cost	87	$ 70
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Historical cash payments for retirement medical plan claims per year	$ 100
Unfunded Postretirement Medical Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | Plan	2