Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Schedule Of Financial Information Concerning Reportable Segments

The following tables summarize financial information concerning our reportable segments:

	For the year Ended December 31,
	2010			2011			2012
	(Dollars in thousands)
Net sales to external customers:
Industrial Materials	$	833,892		$	1,132,194		$	1,025,571
Engineered Solutions	173,101			187,990			222,693
Total net sales	$	1,006,993		$	1,320,184		$	1,248,264
Segment operating income:
Industrial Materials	$	140,217		$	158,547		$	143,268
Engineered Solutions	17,823			7,462			13,200
Total segment operating income	$	158,040		$	166,009		$	156,468
Reconciliation of segment operating income to income from continuing operations before provision for income taxes
Equity in earnings of and gain recorded on acquisition of non-consolidated affiliate	(14,500		)	—			—
Other (income) expense, net	(4,768		)	4,835			(1,005		)
Interest expense	5,076			18,307			23,247
Interest income	(1,333		)	(424		)	(261		)
Income before provision for income taxes	$	173,565		$	143,291		$	134,487

	For the Three Months Ended
	March 31,
	2012			2013
	(Dollars in thousands)
Net sales to external customers:
Industrial Materials	$	192,996		$	208,777
Engineered Solutions	47,942			44,950
Total net sales	$	240,938		$	253,727
Segment operating income:
Industrial Materials	24,925			16,078
Engineered Solutions	(918		)	(334		)
Total segment operating income	$	24,007		$	15,744
Reconciliation of segment operating income to     income before provision for income taxes
Other (income) expense, net	(3,423		)	550
Interest expense	4,762			9,008
Interest income	(81		)	(64		)
Income before provision for income taxes	$	22,749		$	6,250

Schedule Of Long-Lived Assets By Reportable Segment [Table Text Block]

	At December 31,
	2011		2012
	(Dollars in thousands)
Long-lived assets (a):
Industrial Materials.	$	649,389	$	685,243
Engineered Solutions	127,495		148,664
Total long-lived assets	$	776,884	$	833,907

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

The following tables summarize information as to our operations in different geographic areas.

	For the year Ended December 31,
	2010		2011		2012
	(Dollars in thousands)
Net sales:
U.S.	$	203,438	$	353,416	$	372,014
Americas	177,396		252,316		195,748
Asia Pacific	193,061		240,220		235,658
Europe, Middle East, Africa	433,098		474,232		444,844
Total	$	1,006,993	$	1,320,184	$	1,248,264

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

	At December 31,
	2011		2012
	(Dollars in thousands)
Long-lived assets (a):
U.S. and Canada	$	470,196	$	523,818
Mexico	75,145		79,279
Brazil	54,466		47,593
France	52,337		55,792
Spain	76,510		78,392
South Africa	35,559		36,937
Switzerland	5,032		4,829
Other countries	7,639		7,267
Total	$	776,884	$	833,907