Pension Plans and Other Postretirement Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2011

General Discussion of Pension and Other Postretirement Benefits [Abstract]

Components of Net Periodic Cost (Benefit)

The following table details the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefits, or OPEB, for the quarters and nine months ended September 30:

Quarters ended September 30:

	Pension Plans						Other Postretirement Employee Benefits
(Dollars in thousands)	2011			2010			2011			2010
Service cost	$	1,114		$	1,158		$	112		$	104
Interest cost	5,331			5,412			871			993
Expected return on plan assets	(7,951		)	(8,283		)	—			—
Amortization of prior service cost (credit)	171			203			(2,134		)	(2,143		)
Amortization of actuarial loss	2,479			2,043			992			1,158
Net periodic cost (benefit)	$	1,144		$	533		$	(159	)	$	112

Nine months ended September 30:

	Pension Plans						Other Postretirement Employee Benefits
(Dollars in thousands)	2011			2010			2011			2010
Service cost	$	3,342		$	3,474		$	335		$	312
Interest cost	15,994			16,237			2,614			2,979
Expected return on plan assets	(23,853		)	(24,850		)	—			—
Amortization of prior service cost (credit)	513			609			(6,402		)	(6,429		)
Amortization of actuarial loss	7,437			6,130			2,975			3,474
Curtailment loss (gain)	—			64			—			(320		)
Net periodic cost (benefit)	$	3,433		$	1,664		$	(478	)	$	16