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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 |  |

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