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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Goodwill [Line Items]        
Goodwill, impairment loss   $ 35,381    
Amortization expense of intangible assets   8,700 $ 10,200  
Estimated amortization expense, remainder of 2015 $ 8,400 8,400    
Estimated amortization expense, 2016 13,100 13,100    
Estimated amortization expense, 2017 11,800 11,800    
Estimated amortization expense, 2018 10,700 10,700    
Estimated amortization expense, 2019 9,200 $ 9,200    
Needle Coke        
Goodwill [Line Items]        
Goodwill, impairment loss $ 35,400     $ 75,700
Decrease in market prices 18.00%      
Discounted cash flow model, period of forecasted cash flows 17 years      
Discounted cash flow model, discount rate 10.50%