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Business acquisitions - Acquisition of Mt. Holly smelter table (Details) - Mt. Holly Smelter [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 01, 2014
Jun. 30, 2014
Jun. 30, 2014
Consideration:      
Purchase price $ 67,500    
Contingent consideration 13,780    
Economic, working capital and other closing adjustments (13,513)    
Total consideration transferred 67,767    
Assets Acquired:      
Inventories 26,105    
Due from Alumax 20,786    
Prepaid and other current assets 2,527    
Intangible asset 2,580    
Pension asset 30,842    
Property, plant and equipment – net 127,089    
Total assets acquired 209,929    
Liabilities Assumed:      
Accounts payable, trade 41,471    
Accrued and other current liabilities 6,045    
Accrued postretirement benefit costs 2,857    
Asset retirement obligations 10,503    
Deferred taxes 4,804    
Total liabilities assumed 65,680    
Goodwill 4,804    
Pro forma information      
Pro forma revenues   $ 528,457 $ 1,002,612
Pro forma earnings (loss) from continuing operations   $ 20,640 $ (3,577)
Pro forma earnings (loss) per common share, basic (in dollars per share)   $ 0.21 $ (0.04)
Pro forma earnings (loss) per common share, diluted (in dollars per share)   $ 0.21 $ (0.04)
Due from Alumax, purchase price credit 11,269    
Alumina Supply Agreements $ 14,880