Postretirement Benefit Obligations (Tables)

6 Months Ended

Jun. 30, 2011

Postretirement Benefit Obligations

Accumulated Postretirement Benefit Obligations

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
	(in thousands)
Beginning accumulated postretirement benefit obligations	$	7,231		$	8,951		$	7,408		$	9,075
Net benefit payments		(375	)		(272	)		(691	)		(584	)
Service costs		61			81			122			161
Net actuarial losses		—			100			—			100
Accretion of interest		79			108			157			216
Ending accumulated postretirement benefit obligations	$	6,996		$	8,968		$	6,996		$	8,968