Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Goodwill [Line Items]
Goodwill	$ 420,129,000	$ 496,810,000	$ 498,261,000
Amortization expense of intangible assets	19,000,000	20,500,000	22,300,000
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	17,100,000
Future Amortization Expense, 2014	13,100,000
Future Amortization Expense, 2015	11,800,000
Future Amortization Expense, 2016	10,700,000
Future Amortization Expense, 2017	9,200,000
Goodwill, Impairment Loss	76,063,000
Fair Value Inputs, Discount Rate	10.50%
Needle Coke [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss				75,700,000
Advanced Graphite Materials [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss				400,000
Graphite Electrode and Needle Coke [Member] | Industrial Materials [Member]
Goodwill [Line Items]
Goodwill			496,400,000
Advanced Graphite Materials [Member] | Advanced Graphite Materials [Member]
Goodwill [Line Items]
Goodwill			$ 400,000