PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2012

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

Summary of the components of net periodic benefit cost

	Three Months Ended June 30
	Nonunion Defined						Supplemental				Postretirement
	Benefit Pension Plan						Benefit Pension Plan				Health Benefit Plan
	2012			2011			2012		2011		2012			2011
	($ thousands)
Service cost	$	2,297		$	2,164		$	—	$	—	$	78		$	56
Interest cost	2,173			2,488			53		96		188			196
Expected return on plan assets	(3,016		)	(3,146		)	—		—		—			—
Amortization of prior service credit	—			—			—		—		(47		)	(47		)
Amortization of net actuarial loss and other	2,692			1,730			50		82		104			28
Net periodic benefit cost	$	4,146		$	3,236		$	103	$	178	$	323		$	233

	Six Months Ended June 30
	Nonunion Defined						Supplemental				Postretirement
	Benefit Pension Plan						Benefit Pension Plan				Health Benefit Plan
	2012			2011			2012		2011		2012			2011
	($ thousands)
Service cost	$	4,594		$	4,328		$	—	$	—	$	157		$	112
Interest cost	4,346			4,977			105		193		375			391
Expected return on plan assets	(6,032		)	(6,292		)	—		—		—			—
Amortization of prior service credit	—			—			—		—		(95		)	(95		)
Amortization of net actuarial loss and other	5,384			3,460			101		164		208			56
Net periodic benefit cost	$	8,292		$	6,473		$	206	$	357	$	645		$	464