Retirement Benefits

6 Months Ended

Jun. 30, 2012

Retirement Benefits

Note 7.     Retirement Benefits

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

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

As previously disclosed in our consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2011, there are no significant minimum required contributions to our pension plans in 2012.  In the first six months of 2012, we made voluntary contributions to our domestic pension benefit plans of $76.0 million.