Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2011

Related Party Transactions [Abstract]

Transactions with equity-method investees

	2011		2010		2009
	(Dollars in thousands)
Sales	$	8,893	$	8,928	$	6,887
Purchases		9,655		5,048		3,883
Dividends and interest received		1,162		636		530
Commissions and royalties received		402		173		956
Commissions and royalties paid		77		88		86