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Business Segments Geography, Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 551,239 us-gaap_SalesRevenueNet | [1] | $ 500,632 us-gaap_SalesRevenueNet | [2] | $ 458,324 us-gaap_SalesRevenueNet | [3] | $ 420,847 us-gaap_SalesRevenueNet | [4] | $ 401,174 us-gaap_SalesRevenueNet | [5] | $ 399,928 us-gaap_SalesRevenueNet | [6] | $ 331,937 us-gaap_SalesRevenueNet | [7] | $ 321,274 us-gaap_SalesRevenueNet | [8] | $ 1,931,042 us-gaap_SalesRevenueNet |  | $ 1,454,313 us-gaap_SalesRevenueNet |  | $ 1,272,111 us-gaap_SalesRevenueNet |
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,370,570 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US |  | 1,022,081 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US |  | 821,976 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US |
Long-Lived Assets | 487,536 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | [9] |  |  |  |  |  |  | 392,424 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | [9] |  |  |  |  |  |  | 487,536 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | [9] | 392,424 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | [9] | 368,897 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | [9]
Iceland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 560,472 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = exch_ISEC |  | 432,232 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = exch_ISEC |  | 450,135 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = exch_ISEC |
Long-Lived Assets | 831,507 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = exch_ISEC | [9] |  |  |  |  |  |  | 853,636 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = exch_ISEC | [9] |  |  |  |  |  |  | 831,507 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = exch_ISEC | [9] | 853,636 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = exch_ISEC | [9] | 869,809 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = exch_ISEC | [9]
Others [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | $ 95,752 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember | [9] |  |  |  |  |  |  | $ 93,075 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember | [9] |  |  |  |  |  |  | $ 95,752 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember | [9] | $ 93,075 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember | [9] | $ 50,223 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember | [9]
[1] | The fourth quarter of 2014 net income included a benefit of $7,943 for the gain on remeasurement of contingent consideration and a benefit of $1,318 for gain on remeasurement of our equity investment in Mt. Holly. Results were negatively impacted by $4,964 in non-cash, non-recurring pension charges and by $2,616 related to the separation of former senior executives.
[2] | The third quarter of 2014 net income reflects higher aluminum prices and lower power prices in the Midwestern U.S.
[3] | The second quarter of 2014 net income reflects higher aluminum prices and lower power prices in the Midwestern U.S. Results were negatively impacted by a charge of $500 for the finalization of a legal settlement.
[4] | The first quarter of 2014 cost of sales included a benefit of $5,534 related to deferred power contract liability amortization. Results were negatively impacted by a $3,100 charge for increased legal reserves.
[5] | The fourth quarter of 2013 cost of sales included a benefit of $16,570 related to deferred power contract liability amortization. During the quarter, inventory that had previously been written down to its market basis was consumed into cost of goods sold and inventory at the end of the quarter was written down to its market basis. The net impact of these valuation adjustments on costs of goods sold was a credit of $9,040. The financial results also include an $8,400 charge relating to the separation of our former CEO.
[6] | The third quarter of 2013 cost of sales included an $11,720 benefit for deferred power contract liability amortization. During the quarter, inventory that had previously been written down to its market basis was consumed into cost of goods sold and inventory at the end of the quarter was written down to its market basis. The net impact of these valuation adjustments on costs of goods sold was a credit of $5,762.
[7] | The second quarter of 2013 amounts differ from our reported second quarter results due to purchase price accounting adjustments related to the Sebree acquisition which were retroactively applied to the second quarter of 2013. The second quarter of 2013 net loss included a gain on bargain purchase of $5,253 and power contract amortization of $2,741 associated with the Sebree acquisition. Results were negatively impacted by a charge of $3,272 for the early extinguishment of our 8.0% Notes and a charge for severance and other expenses of $1,750 related to our corporate headquarters relocation. During the quarter, inventory that had previously been written down to its market basis was consumed into cost of goods sold and inventory at the end of the quarter was written down to its market basis. The net impact of these valuation adjustments on costs of goods sold was a charge of $10,211.
[8] | The first quarter of 2013 net income included a net benefit of $2,225 related to a litigation reserve adjustment and an unrealized gain of $15,722 related to a LME-based contingent obligation. Results were negatively impacted by severance and other expenses of $2,213 related to our corporate headquarters relocation. The net effect of reporting inventory on a lower of cost or market basis was a charge to cost of goods sold of $5,838 in the quarter.
[9] | Includes long-lived assets other than financial instruments.

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