XML 26 R37.htm IDEA: XBRL DOCUMENT v3.2.0.727
Ravenswood impairment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]        
Ravenswood impairment $ 30,850 $ 0 $ 30,850 $ 0
Write-down of inventory     25,689 $ (1,247)
Employee Severance and Postemployment Benefits [Member]        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring cost $ 1,550   1,550  
Ravenswood Aluminum Smelter [Member]        
Restructuring Cost and Reserve [Line Items]        
Ravenswood impairment     30,850  
Impairment of assets     21,500  
Write-down of inventory     $ 7,800