Segment Reporting (Schedule Of Financial Information Concerning Reportable Segments) (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales		$ 1,085,304,000	$ 1,166,674,000	$ 1,248,264,000
Total segment operating income (loss)		(255,620,000)	(2,570,000)	156,468,000
Equity in earnings of and gain recorded on acquisition of non-consolidated affiliate		0	0	0
Other (income) expense, net		2,445,000	1,698,000	(1,005,000)
Interest expense		37,057,000	36,037,000	23,247,000
Interest income		(330,000)	(203,000)	(261,000)
Income before income taxes		(294,792,000)	(40,102,000)	134,487,000
Impairment of long-lived assets and goodwill	75,700,000	197,220,000	0	0
Loss Related to Bankruptcy of Major Customer		4,800,000
Industrial Materials [Member]
Segment Reporting Information [Line Items]
Net sales		840,103,000	909,448,000	1,025,571,000
Total segment operating income (loss)		(50,260,000)	20,007,000	197,335,000
Other (income) expense, net			60,300,000	34,500,000
Mark To Market Adjustment		3,500,000	4,200,000
Engineered Solutions [Member]
Segment Reporting Information [Line Items]
Net sales		245,201,000	257,226,000	222,693,000
Total segment operating income (loss)		(138,271,000)	28,392,000	22,374,000
Other (income) expense, net			3,600,000	22,000,000
Mark To Market Adjustment		9,200,000	5,900,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total segment operating income (loss)		(67,089,000)	(50,969,000)	(63,241,000)
Other (income) expense, net			1,800,000	6,300,000
Mark To Market Adjustment		(6,300,000)	4,200,000
Proxy Context Costs		$ 2,400,000