Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Significant Accounting Policies [Abstract]

Detailed information about the allowance for doubtful accounts

	2011		2010		2009
	(Dollars in thousands)
Allowance for doubtful accounts	$	10,443	$	11,156	$	10,685
Bad debt expense		2,349		2,935		2,676

Estimated useful lives of property, plant and equipment

Buildings	20 to 40 years
Machinery and equipment	5 to 15 years