PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost for RIGP and Retiree Medical Plan

The components of the net periodic benefit cost for the RIGP and Retiree Medical Plan were as follows for the three months ended March 31, 2016 and 2015 (in thousands):

	RIGP						Retiree Medical Plan
	Three Months Ended   March 31,						Three Months Ended   March 31,
	2016			2015			2016		2015
Service cost	$	(9	)	$	3		$	91	$	91
Interest cost	127			138			333		333
Expected return on plan assets	(71		)	(84		)	—		—
Amortization of unrecognized losses	145			211			50		50
Net periodic benefit cost	$	192		$	268		$	474	$	474