PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)

6 Months Ended

Jun. 30, 2013

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 June 30, 2013 and 2012 (in thousands):

	RIGP						Retiree Medical Plan
	Three Months Ended						Three Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Service cost	$	55		$	61		$	71		$	78
Interest cost	187			207			404			448
Expected return on plan assets	(103		)	(113		)	—			—
Amortization of prior service cost	—			—			(615		)	(683		)
Amortization of unrecognized losses	308			343			284			315
Actuarial loss due to settlements	112			—			—			—
Net periodic benefit cost	$	559		$	498		$	144		$	158

The components of the net periodic benefit cost for the RIGP and the Retiree Medical Plan were as follows for the six months ended June 30, 2013 and 2012 (in thousands):

	RIGP						Retiree Medical Plan
	Six Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Service cost	$	122		$	132		$	157		$	154
Interest cost	414			414			897			930
Expected return on plan assets	(227		)	(200		)	—			—
Amortization of prior service cost	—			—			(1,365		)	(1,424		)
Amortization of unrecognized losses	685			797			630			626
Actuarial loss due to settlements	453			—			—			—
Net periodic benefit cost	$	1,447		$	1,143		$	319		$	286