PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2013

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

Summary of the components of net periodic benefit cost

	Three Months Ended March 31
	Nonunion Defined						Supplemental				Postretirement
	Benefit Pension Plan						Benefit Pension Plan				Health Benefit Plan
	2013			2012			2013		2012		2013			2012
	(in thousands)
Service cost	$	2,367		$	2,297		$	—	$	—	$	83		$	79
Interest cost	1,923			2,173			37		52		188			187
Expected return on plan assets	(3,154		)	(3,016		)	—		—		—			—
Amortization of prior service credit	—			—			—		—		(48		)	(48		)
Amortization of net actuarial loss and other	2,713			2,692			65		51		134			104
Net periodic benefit cost	$	3,849		$	4,146		$	102	$	103	$	357		$	322