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Acquisition of Sebree aluminum smelter (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 13 Months Ended |  | 2 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2013 Sebree Smelter [Member] | Jun. 30, 2014 Sebree Smelter [Member] | Jun. 30, 2013 Sebree Smelter [Member] | Jun. 30, 2014 Sebree Smelter [Member] | Jun. 01, 2013 Sebree Smelter [Member] t | Aug. 08, 2014 Sebree Working Capital Resolution [Member] Sebree Smelter [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Sebree primary aluminum capacity (tonnes) |  |  |  |  |  |  |  |  | 205,000 |
Purchase price for acquisition |  |  |  |  |  |  |  |  | $ 61,000 |
Purchase price cash paid |  |  | 0 | 48,058 |  |  |  | 48,000 |  | 49,035
Gain on bargain purchase | 0 | 5,253 | 0 | 5,253 |  |  |  | 5,253 |  |
Cash |  |  |  |  |  |  |  | 48,083 |  |
Deferred purchase price |  |  |  |  |  |  |  | 1,910 |  |
Inventories |  |  |  |  |  | 59,018 |  | 59,018 |  |
Prepaid and other current assets |  |  |  |  |  | 2,273 |  | 2,273 |  |
Property, plant and equipment – net |  |  |  |  |  | 55,520 |  | 55,520 |  |
Total assets acquired |  |  |  |  |  | 116,811 |  | 116,811 |  |
Accrued and other current liabilities |  |  |  |  |  | 43,316 |  | 43,316 |  |
Accrued pension benefit costs |  |  |  |  |  | 996 |  | 996 |  |
Accrued post retirement benefit costs |  |  |  |  |  | 6,544 |  | 6,544 |  |
Other liabilities |  |  |  |  |  | 7,476 |  | 7,476 |  |
Deferred taxes |  |  |  |  |  | 3,233 |  | 3,233 |  |
Total liabilities assumed |  |  |  |  |  | 61,565 |  | 61,565 |  |
Sebree power contract amortization |  |  | (5,534) | (2,741) |  | 5,534 |  |  |  |
Pro forma revenues |  |  |  |  | 413,907 |  | 861,605 |  |  |
Pro forma loss from continuing operations |  |  |  |  | $ (36,253) |  | $ (37,205) |  |  |
Loss per common share, basic |  |  |  |  | $ (0.41) |  | $ (0.42) |  |  |
Loss per common share, diluted |  |  |  |  | $ (0.41) |  | $ (0.42) |  |  |

X
- Definition The aggregate benefit recognized in earnings to allocate the assumed power contract liability in a systematic and rational manner over the contract period. As a noncash benefit, this element is subtracted from net income when calculating cash provided by or used in operations using the indirect method. + References No definition available. + Details
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