PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 2015

PENSIONS AND OTHER POSTRETIREMENT BENEFITS

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, 2015 and 2014 (in thousands):

	RIGP						Retiree Medical Plan
	Three Months Ended						Three Months Ended
	March 31,						March 31,
	2015			2014			2015		2014
Service cost	$	3		$	54		$	91	$	108
Interest cost	138			134			333		352
Expected return on plan assets	(84		)	(98		)	—		—
Amortization of prior service credit	—			—			—		(406		)
Amortization of unrecognized losses	211			308			50		298
Actuarial loss due to settlements	—			193			—		—
Net periodic benefit cost	$	268		$	591		$	474	$	352