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Rationalizations Rationalization Text (Details)
metric_tons in Thousands, $ in Thousands
3 Months Ended 5 Months Ended 7 Months Ended 12 Months Ended
Mar. 02, 2015
employee
Sep. 30, 2015
USD ($)
Sep. 30, 2014
Dec. 31, 2015
USD ($)
Aug. 14, 2015
USD ($)
Dec. 31, 2015
USD ($)
employee
metric_tons
Dec. 31, 2014
USD ($)
Restructuring Cost and Reserve [Line Items]              
Property, plant and equipment       $ 660,880   $ 660,880 $ 1,500,821
Other       16,790   $ 16,790 22,702
Payments for Restructuring       17 $ 1,102   $ 16,494
2013 Industrial Materials Rationalization [Member]              
Restructuring Cost and Reserve [Line Items]              
Estimated Reduction in Capacity | metric_tons           60  
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee           600  
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent             20.00%
2013 Engineered Solutions Rationalization [Member]              
Restructuring Cost and Reserve [Line Items]              
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee           40  
2013 Rationalization Initiatives [Member]              
Restructuring Cost and Reserve [Line Items]              
Gain (Loss) on Disposition of Property Plant Equipment   $ 0          
2014 Engineered Solutions Rationalization [Member]              
Restructuring Cost and Reserve [Line Items]              
Payments for Restructuring       72 916   $ 916
2014 Corporate and Research & Development Rationalization [Member]              
Restructuring Cost and Reserve [Line Items]              
Restructuring and Related Cost, Expected Cost       20,000   $ 20,000  
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent     25.00%        
Payments for Restructuring       1,127 4,611 12,000 1,155
2015 Advanced Graphite Materials Rationalization [Member]              
Restructuring Cost and Reserve [Line Items]              
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee 85            
Payments for Restructuring       3,418 $ 329    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | 2013 Rationalization Initiatives [Member]              
Restructuring Cost and Reserve [Line Items]              
Property, plant and equipment       6,600   6,600  
Other       1,200   1,200  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | 2014 Corporate and Research & Development Rationalization [Member]              
Restructuring Cost and Reserve [Line Items]              
Property, plant and equipment       3,900   3,900  
Other       $ 3,600   3,600  
Impairments [Member] | 2014 Engineered Solutions Rationalization [Member]              
Restructuring Cost and Reserve [Line Items]              
Impairments (recorded in Impairments)           $ 121,570 $ 121,600