Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2012

Other Postretirement Benefits

Components of Net Periodic Benefit Costs

The components of the net periodic other postretirement benefits costs are as follows:

	Three Months Ended						Six Months Ended
	June 30,			June 30,			June 30,			June 30,
	2012			2011			2012			2011
	(Dollars in thousands)
Service cost	$	228		$	259		$	455		$	518
Interest cost		571			658			1,140			1,315
Amortization of prior service credit		(654	)		(643	)		(1,308	)		(1,285	)
Amortization of actuarial losses		53			142			142			284
Net periodic benefit cost	$	198		$	416		$	429		$	832

Pension Benefits

Components of Net Periodic Benefit Costs

The components of the net periodic pension benefit costs are as follows:

	Three Months Ended						Six Months Ended
	June 30,			June 30,			June 30,			June 30,
	2012			2011			2012			2011
	(Dollars in thousands)
Service cost	$	3,676		$	3,740		$	7,399		$	7,510
Interest cost		6,920			7,144			13,829			14,314
Expected return on plan assets		(11,801	)		(10,186	)		(22,314	)		(20,400	)
Amortization of prior service cost		477			510			953			1,021
Amortization of actuarial losses		3,088			1,993			6,176			3,985
Net periodic benefit cost	$	2,360		$	3,201		$	6,043		$	6,430