Postretirement Benefit Obligations (Tables)

3 Months Ended

Mar. 31, 2012

Postretirement Benefit Obligations [Abstract]

Schedule Of Accumulated Postretirement Benefit Obligations

	Three Months Ended March  31,
	2012			2011
	(in thousands)
Beginning accumulated postretirement benefit obligations	$	7,456		$	7,408
Net benefit payments		(520	)		(316	)
Service costs		85			61
Accretion of interest		64			78
Ending accumulated postretirement benefit obligations	$	7,085		$	7,231