Segment Reporting (Schedule of Financial Information Concerning Reportable Segments) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net sales	$ 320,231	$ 254,854	$ 626,368	$ 470,518
Total segment operating income	39,569	40,797	77,215	85,423
Equity in earnings of non-consolidated affiliate	0	(1,684)	0	(910)
Other income, net	(196)	(8,596)	(187)	(11,855)
Interest expense	4,584	1,296	8,988	2,202
Interest income	(115)	(507)	(244)	(1,068)
Income before provision for income taxes	35,296	50,288	68,658	97,054
Industrial Materials [Member]
Net sales	269,751	208,723	533,236	391,146
Total segment operating income	32,136	35,379	66,335	78,274
Engineered Solutions [Member]
Net sales	50,480	46,131	93,132	79,372
Total segment operating income	$ 7,433	$ 5,418	$ 10,880	$ 7,149