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Rationalizations and Impairments (Narrative) (Details)
metric_tons in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 02, 2015
USD ($)
employee
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
employee
metric_tons
Jun. 30, 2014
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
2013 Rationalization Initiatives            
Restructuring Cost and Reserve [Line Items]            
Expected cash outlay     $ 1,132     $ 16,494
Industrial Materials Segment            
Restructuring Cost and Reserve [Line Items]            
Estimated reduction in capacity (metric tons) | metric_tons     60      
Expected number of positions eliminated (employees) | employee     600      
Number of positions eliminated (percent)       20.00%    
Engineered Solutions Segment            
Restructuring Cost and Reserve [Line Items]            
Expected number of positions eliminated (employees) | employee     40      
2014 Engineered Solutions Rationalization            
Restructuring Cost and Reserve [Line Items]            
Expected cash outlay     $ 780     916
2014 Corporate and Research & Development Rationalization            
Restructuring Cost and Reserve [Line Items]            
Number of positions eliminated (percent)   25.00%        
Expected cost   $ 20,000        
Expected cash outlay     4,199     $ 1,155
2014 Corporate and Research & Development Rationalization | Scenario, Forecast            
Restructuring Cost and Reserve [Line Items]            
Expected cash outlay         $ 12,000  
2015 Advanced Graphite Materials Rationalization            
Restructuring Cost and Reserve [Line Items]            
Expected number of positions eliminated (employees) | employee 85          
Expected cost $ 10,000          
Expected cash outlay     $ 263      
2015 Advanced Graphite Materials Rationalization | Scenario, Forecast            
Restructuring Cost and Reserve [Line Items]            
Expected cash outlay         $ 8,000