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Condensed consolidating financial information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Guarantor Obligations [Line Items]                
Percentage of subsidiary guarantor owned by company (in hundredths)     100.00%          
Assets:                
Cash and cash equivalents $ 61,384 $ 127,531 $ 61,384 $ 127,531        
Restricted cash 3,031   3,031     1,697    
Accounts receivable — net 52,253   52,253     56,184    
Due from affiliates 54,094   54,094     43,587    
Inventories 243,648   243,648     239,615    
Prepaid and other current assets 25,320   25,320     32,276    
Deferred taxes 13,614   13,614     13,614    
Total current assets 453,344   453,344     471,061    
Investment in subsidiaries 0   0     0    
Property, plant and equipment — net 1,230,014   1,230,014     1,247,661    
Due from affiliates — less current portion 0   0     0    
Other assets 93,122   93,122     91,474    
TOTAL 1,776,480   1,776,480     1,810,196    
Liabilities and shareholders' equity:                
Accounts payable, trade 95,897   95,897     108,490    
Due to affiliates 52,356   52,356     53,582    
Accrued and other current liabilities 45,182   45,182     69,466    
Accrued employee benefits costs 8,533   8,533     8,410    
Industrial revenue bonds 7,815   7,815     7,815    
Total current liabilities 209,783   209,783     247,763    
Senior notes payable 246,705   246,705     246,528    
Accrued pension benefit costs — less current portion 41,724   41,724     39,848    
Accrued postretirement benefits costs — less current portion 128,287   128,287     129,284    
Other liabilities/intercompany loan 37,416   37,416     37,743    
Deferred taxes 108,932   108,932     106,218    
Total noncurrent liabilities 563,064   563,064     559,621    
Shareholders' equity:                
Series A Preferred stock 1   1     1    
Common stock 936   936     935    
Additional paid-in capital 2,509,186   2,509,186     2,508,574    
Treasury stock, at cost (49,924)   (49,924)     (49,924)    
Accumulated other comprehensive loss (91,864) (139,163) (91,864) (139,163) (91,733) (91,832) (150,297) (151,192)
Retained earnings (accumulated deficit) (1,364,702)   (1,364,702)     (1,364,942)    
Total shareholders’ equity 1,003,633   1,003,633     1,002,812    
Total 1,776,480   1,776,480     1,810,196    
Net sales:                
Third-party customers 169,751 220,950 305,015 409,464        
Related parties 288,573 110,987 574,156 243,747        
Sales Revenue – net 458,324 331,937 879,171 653,211        
Cost of goods sold 419,820 337,635 842,425 641,327        
Gross profit (loss) 38,504 (5,698) 36,746 11,884        
Other operating expense – net 1,874 3,018 4,288 4,114        
Selling, general and administrative expenses 10,618 15,154 20,680 31,453        
Operating income 26,012 (23,870) 11,778 (23,683)        
Interest expense – third party (5,571) (6,224) (11,048) (12,300)        
Interest expense – affiliates 0 0 0 0        
Interest income – third party 34 186 174 317        
Net gain (loss) on forward and derivative contracts 352 204 (527) 15,711        
Gain on bargain purchase 0 5,253 0 5,253        
Loss on early extinguishment of debt 0 (3,272) 0 (3,272)        
Other income (expense) – net 300 (1,284) 47 (1,214)        
Income (loss) before income taxes and equity in earnings (losses) of subsidiaries and joint ventures 21,127 (29,007) 424 (19,188)        
Income tax expense (1,654) (813) (560) (3,330)        
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures 19,473 (29,820) (136) (22,518)        
Equity in earnings (losses) of subsidiaries and joint ventures 871 436 376 1,387        
Net income (loss) 20,344 (29,384) 240 (21,131)        
Other comprehensive income before income tax effect 436 11,517 1,248 12,794        
Income tax effect (567) (383) (1,280) (765)        
Other comprehensive income (loss) (131) 11,134 (32) 12,029        
Comprehensive income (loss) 20,213 (18,250) 208 (9,102)        
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS                
Net cash provided by operating activities     8,628 22,976        
Purchase of property, plant and equipment     (16,758) (16,565)        
Nordural expansion — Helguvik     (186) (2,559)        
Purchase of carbon anode assets and improvements     (7,226) (3,670)        
Purchase of Sebree smelter     0 (48,058)        
Proceeds from sale of property, plant and equipment     46 515        
Restricted and other cash deposits     (1,334) (720)        
Net cash used in investing activities     (25,458) (71,057)        
Financing activities:                
Repayment of debt     0 (249,604)        
Proceeds from issuance of debt     0 246,330        
Borrowings under revolving credit facilities     86,646 0        
Repayments under revolving credit facilities     (92,646) 0        
Debt issuance costs     0 (3,926)        
Debt retirement costs     0 (1,208)        
Intercompany transactions     0 0        
Issuance of common stock     126 44        
Net cash provided by (used in) financing activities     (5,874) (8,364)        
Change in cash and cash equivalents     (22,704) (56,445)        
Cash and cash equivalents, beginning of period     84,088 183,976        
Cash and cash equivalents, end of period 61,384 127,531 61,384 127,531        
Senior unsecured notes due August 15, 2014 [Member]
                
Guarantor Obligations [Line Items]                
Interest rate (in hundredths) 7.50%   7.50%          
Combined Guarantor Subsidiaries [Member]
                
Assets:                
Cash and cash equivalents 0 0 0 0        
Restricted cash 2,789   2,789     787    
Accounts receivable — net 51,687   51,687     45,205    
Due from affiliates 313,628   313,628     303,031    
Inventories 158,398   158,398     166,137    
Prepaid and other current assets 2,200   2,200     6,350    
Deferred taxes 0   0     0    
Total current assets 528,702   528,702     521,510    
Investment in subsidiaries 64,904   64,904     55,929    
Property, plant and equipment — net 339,951   339,951     351,096    
Due from affiliates — less current portion 0   0     0    
Other assets 20,034   20,034     21,163    
TOTAL 953,591   953,591     949,698    
Liabilities and shareholders' equity:                
Accounts payable, trade 52,546   52,546     65,384    
Due to affiliates 2,036,103   2,036,103     2,015,550    
Accrued and other current liabilities 18,936   18,936     25,419    
Accrued employee benefits costs 6,692   6,692     12,880    
Industrial revenue bonds 7,815   7,815     7,815    
Total current liabilities 2,122,092   2,122,092     2,127,048    
Senior notes payable 0   0     0    
Accrued pension benefit costs — less current portion 13,177   13,177     6,183    
Accrued postretirement benefits costs — less current portion 123,771   123,771     124,466    
Other liabilities/intercompany loan 57,359   57,359     58,367    
Deferred taxes 0   0     0    
Total noncurrent liabilities 194,307   194,307     189,016    
Shareholders' equity:                
Series A Preferred stock 0   0     0    
Common stock 60   60     60    
Additional paid-in capital 275,467   275,467     268,467    
Treasury stock, at cost 0   0     0    
Accumulated other comprehensive loss (90,978)   (90,978)     (92,803)    
Retained earnings (accumulated deficit) (1,547,357)   (1,547,357)     (1,542,090)    
Total shareholders’ equity (1,362,808)   (1,362,808)     (1,366,366)    
Total 953,591   953,591     949,698    
Net sales:                
Third-party customers 169,747 173,986 304,999 311,084        
Related parties 157,807 51,651 321,847 118,280        
Sales Revenue – net 327,554 225,637 626,846 429,364        
Cost of goods sold 307,005 250,395 619,629 461,580        
Gross profit (loss) 20,549 (24,758) 7,217 (32,216)        
Other operating expense – net 1,874 3,018 4,288 4,114        
Selling, general and administrative expenses 10,180 11,755 19,551 24,644        
Operating income 8,495 (39,531) (16,622) (60,974)        
Interest expense – third party (5,500) (6,224) (10,919) (12,300)        
Interest expense – affiliates 12,430 14,521 24,891 29,017        
Interest income – third party 2 17 5 31        
Net gain (loss) on forward and derivative contracts 352 204 (527) 15,711        
Gain on bargain purchase   5,253   5,253        
Loss on early extinguishment of debt   (3,272)   (3,272)        
Other income (expense) – net 436 (128) 216 (9)        
Income (loss) before income taxes and equity in earnings (losses) of subsidiaries and joint ventures 16,215 (29,160) (2,956) (26,543)        
Income tax expense (5,743) 1,318 (4,296) (5,784)        
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures 10,472 (27,842) (7,252) (32,327)        
Equity in earnings (losses) of subsidiaries and joint ventures 2,353 (3,044) 1,987 (5,266)        
Net income (loss) 12,825 (30,886) (5,265) (37,593)        
Other comprehensive income before income tax effect 466 10,006 1,056 11,090        
Income tax effect (558) (357) (1,263) (748)        
Other comprehensive income (loss) (92) 9,649 (207) 10,342        
Comprehensive income (loss) 12,733 (21,237) (5,472) (27,251)        
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS                
Net cash provided by operating activities     4,808 34,027        
Purchase of property, plant and equipment     (7,210) (5,240)        
Nordural expansion — Helguvik     0 0        
Purchase of carbon anode assets and improvements     0 0        
Purchase of Sebree smelter       (48,058)        
Proceeds from sale of property, plant and equipment     0 0        
Restricted and other cash deposits     (2,002) 258        
Net cash used in investing activities     (9,212) (53,040)        
Financing activities:                
Repayment of debt       0        
Proceeds from issuance of debt       0        
Borrowings under revolving credit facilities     0          
Repayments under revolving credit facilities     0          
Debt issuance costs       0        
Debt retirement costs       0        
Intercompany transactions     4,404 19,013        
Issuance of common stock     0 0        
Net cash provided by (used in) financing activities     4,404 19,013        
Change in cash and cash equivalents     0 0        
Cash and cash equivalents, beginning of period     0 0        
Cash and cash equivalents, end of period 0 0 0 0        
Combined Non-Guarantor Subsidiaries [Member]
                
Assets:                
Cash and cash equivalents 44,984 82,104 44,984 82,104        
Restricted cash 242   242     910    
Accounts receivable — net 566   566     10,979    
Due from affiliates 46,875   46,875     36,995    
Inventories 87,129   87,129     73,478    
Prepaid and other current assets 17,588   17,588     20,531    
Deferred taxes 13,614   13,614     14,540    
Total current assets 210,998   210,998     195,410    
Investment in subsidiaries 0   0     0    
Property, plant and equipment — net 889,052   889,052     895,381    
Due from affiliates — less current portion 41,928   41,928     32,066    
Other assets 38,088   38,088     33,132    
TOTAL 1,180,066   1,180,066     1,155,989    
Liabilities and shareholders' equity:                
Accounts payable, trade 42,627   42,627     42,351    
Due to affiliates 101,807   101,807     97,351    
Accrued and other current liabilities 16,984   16,984     26,005    
Accrued employee benefits costs 0   0     0    
Industrial revenue bonds 0   0     0    
Total current liabilities 161,418   161,418     165,707    
Senior notes payable 0   0     0    
Accrued pension benefit costs — less current portion 0   0     0    
Accrued postretirement benefits costs — less current portion 0   0     0    
Other liabilities/intercompany loan 564,004   564,004     548,985    
Deferred taxes 108,932   108,932     106,218    
Total noncurrent liabilities 672,936   672,936     655,203    
Shareholders' equity:                
Series A Preferred stock 0   0     0    
Common stock 12   12     12    
Additional paid-in capital 182,943   182,943     179,493    
Treasury stock, at cost 0   0     0    
Accumulated other comprehensive loss (1,754)   (1,754)     (1,678)    
Retained earnings (accumulated deficit) 164,511   164,511     157,252    
Total shareholders’ equity 345,712   345,712     335,079    
Total 1,180,066   1,180,066     1,155,989    
Net sales:                
Third-party customers 4 46,964 16 98,380        
Related parties 130,766 59,336 252,309 125,467        
Sales Revenue – net 130,770 106,300 252,325 223,847        
Cost of goods sold 112,815 87,240 222,796 179,747        
Gross profit (loss) 17,955 19,060 29,529 44,100        
Other operating expense – net 0 0 0 0        
Selling, general and administrative expenses 438 3,399 1,129 6,809        
Operating income 17,517 15,661 28,400 37,291        
Interest expense – third party (71) 0 (129) 0        
Interest expense – affiliates (12,430) (14,521) (24,891) (29,017)        
Interest income – third party 32 169 169 286        
Net gain (loss) on forward and derivative contracts 0 0 0 0        
Gain on bargain purchase   0   0        
Loss on early extinguishment of debt   0   0        
Other income (expense) – net (54) (1,156) (87) (1,205)        
Income (loss) before income taxes and equity in earnings (losses) of subsidiaries and joint ventures 4,994 153 3,462 7,355        
Income tax expense 3,972 (2,131) 3,428 2,454        
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures 8,966 (1,978) 6,890 9,809        
Equity in earnings (losses) of subsidiaries and joint ventures 871 436 376 1,387        
Net income (loss) 9,837 (1,542) 7,266 11,196        
Other comprehensive income before income tax effect (46) (46) (93) (93)        
Income tax effect 9 8 17 17        
Other comprehensive income (loss) (37) (38) (76) (76)        
Comprehensive income (loss) 9,800 (1,580) 7,190 11,120        
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS                
Net cash provided by operating activities     3,820 (11,051)        
Purchase of property, plant and equipment     (9,502) (10,751)        
Nordural expansion — Helguvik     (186) (2,559)        
Purchase of carbon anode assets and improvements     (7,226) (3,670)        
Purchase of Sebree smelter       0        
Proceeds from sale of property, plant and equipment     46 515        
Restricted and other cash deposits     668 (978)        
Net cash used in investing activities     (16,200) (17,443)        
Financing activities:                
Repayment of debt       0        
Proceeds from issuance of debt       0        
Borrowings under revolving credit facilities     0          
Repayments under revolving credit facilities     (6,000)          
Debt issuance costs       0        
Debt retirement costs       0        
Intercompany transactions     25,387 582        
Issuance of common stock     0 0        
Net cash provided by (used in) financing activities     19,387 582        
Change in cash and cash equivalents     7,007 (27,912)        
Cash and cash equivalents, beginning of period     37,977 110,016        
Cash and cash equivalents, end of period 44,984 82,104 44,984 82,104        
The Company [Member]
                
Assets:                
Cash and cash equivalents 16,400 45,427 16,400 45,427        
Restricted cash 0   0     0    
Accounts receivable — net 0   0     0    
Due from affiliates 2,321,841   2,321,841     2,304,874    
Inventories 180   180     0    
Prepaid and other current assets 5,224   5,224     5,395    
Deferred taxes 0   0     0    
Total current assets 2,343,645   2,343,645     2,356,380    
Investment in subsidiaries (1,078,450)   (1,078,450)     (1,087,216)    
Property, plant and equipment — net 1,451   1,451     1,621    
Due from affiliates — less current portion 0   0     0    
Other assets 32,214   32,214     32,431    
TOTAL 1,298,860   1,298,860     1,303,216    
Liabilities and shareholders' equity:                
Accounts payable, trade 724   724     755    
Due to affiliates 0   0     0    
Accrued and other current liabilities 10,485   10,485     16,486    
Accrued employee benefits costs 1,841   1,841     2,737    
Industrial revenue bonds 0   0     0    
Total current liabilities 13,050   13,050     19,978    
Senior notes payable 246,705   246,705     246,528    
Accrued pension benefit costs — less current portion 28,547   28,547     26,458    
Accrued postretirement benefits costs — less current portion 4,516   4,516     4,818    
Other liabilities/intercompany loan 2,409   2,409     2,622    
Deferred taxes 0   0     0    
Total noncurrent liabilities 282,177   282,177     280,426    
Shareholders' equity:                
Series A Preferred stock 1   1     1    
Common stock 936   936     935    
Additional paid-in capital 2,509,186   2,509,186     2,508,574    
Treasury stock, at cost (49,924)   (49,924)     (49,924)    
Accumulated other comprehensive loss (91,864)   (91,864)     (91,832)    
Retained earnings (accumulated deficit) (1,364,702)   (1,364,702)     (1,364,942)    
Total shareholders’ equity 1,003,633   1,003,633     1,002,812    
Total 1,298,860   1,298,860     1,303,216    
Net sales:                
Third-party customers 0 0 0 0        
Related parties 0 0 0 0        
Sales Revenue – net 0 0 0 0        
Cost of goods sold 0 0 0 0        
Gross profit (loss) 0 0 0 0        
Other operating expense – net 0 0 0 0        
Selling, general and administrative expenses 0 0 0 0        
Operating income 0 0 0 0        
Interest expense – third party 0 0 0 0        
Interest expense – affiliates 0 0 0 0        
Interest income – third party 0 0 0 0        
Net gain (loss) on forward and derivative contracts 0 0 0 0        
Gain on bargain purchase   0   0        
Loss on early extinguishment of debt   0   0        
Other income (expense) – net 0 0 0 0        
Income (loss) before income taxes and equity in earnings (losses) of subsidiaries and joint ventures 0 0 0 0        
Income tax expense 0 0 0 0        
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures 0 0 0 0        
Equity in earnings (losses) of subsidiaries and joint ventures 20,344 (29,384) 240 (21,131)        
Net income (loss) 20,344 (29,384) 240 (21,131)        
Other comprehensive income before income tax effect 436 11,517 1,248 12,794        
Income tax effect (567) (383) (1,280) (765)        
Other comprehensive income (loss) (131) 11,134 (32) 12,029        
Comprehensive income (loss) 20,213 (18,250) 208 (9,102)        
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS                
Net cash provided by operating activities     0 0        
Purchase of property, plant and equipment     (46) (574)        
Nordural expansion — Helguvik     0 0        
Purchase of carbon anode assets and improvements     0 0        
Purchase of Sebree smelter       0        
Proceeds from sale of property, plant and equipment     0 0        
Restricted and other cash deposits     0 0        
Net cash used in investing activities     (46) (574)        
Financing activities:                
Repayment of debt       (249,604)        
Proceeds from issuance of debt       246,330        
Borrowings under revolving credit facilities     86,646          
Repayments under revolving credit facilities     (86,646)          
Debt issuance costs       (3,926)        
Debt retirement costs       (1,208)        
Intercompany transactions     (29,791) (19,595)        
Issuance of common stock     126 44        
Net cash provided by (used in) financing activities     (29,665) (27,959)        
Change in cash and cash equivalents     (29,711) (28,533)        
Cash and cash equivalents, beginning of period     46,111 73,960        
Cash and cash equivalents, end of period 16,400 45,427 16,400 45,427        
Reclassifications and Eliminations [Member]
                
Assets:                
Cash and cash equivalents 0   0          
Restricted cash 0   0     0    
Accounts receivable — net 0   0     0    
Due from affiliates (2,628,250)   (2,628,250)     (2,601,313)    
Inventories (2,059)   (2,059)     0    
Prepaid and other current assets 308   308     0    
Deferred taxes 0   0     (926)    
Total current assets (2,630,001)   (2,630,001)     (2,602,239)    
Investment in subsidiaries 1,013,546   1,013,546     1,031,287    
Property, plant and equipment — net (440)   (440)     (437)    
Due from affiliates — less current portion (41,928)   (41,928)     (32,066)    
Other assets 2,786   2,786     4,748    
TOTAL (1,656,037)   (1,656,037)     (1,598,707)    
Liabilities and shareholders' equity:                
Accounts payable, trade 0   0     0    
Due to affiliates (2,085,554)   (2,085,554)     (2,059,319)    
Accrued and other current liabilities (1,223)   (1,223)     1,556    
Accrued employee benefits costs 0   0     (7,207)    
Industrial revenue bonds 0   0     0    
Total current liabilities (2,086,777)   (2,086,777)     (2,064,970)    
Senior notes payable 0   0     0    
Accrued pension benefit costs — less current portion 0   0     7,207    
Accrued postretirement benefits costs — less current portion 0   0     0    
Other liabilities/intercompany loan (586,356)   (586,356)     (572,231)    
Deferred taxes 0   0     0    
Total noncurrent liabilities (586,356)   (586,356)     (565,024)    
Shareholders' equity:                
Series A Preferred stock 0   0     0    
Common stock (72)   (72)     (72)    
Additional paid-in capital (458,410)   (458,410)     (447,960)    
Treasury stock, at cost 0   0     0    
Accumulated other comprehensive loss 92,732   92,732     94,481    
Retained earnings (accumulated deficit) 1,382,846   1,382,846     1,384,838    
Total shareholders’ equity 1,017,096   1,017,096     1,031,287    
Total (1,656,037)   (1,656,037)     (1,598,707)    
Net sales:                
Third-party customers 0 0 0 0        
Related parties 0 0 0 0        
Sales Revenue – net 0 0 0 0        
Cost of goods sold 0 0 0 0        
Gross profit (loss) 0 0 0 0        
Other operating expense – net 0 0 0 0        
Selling, general and administrative expenses 0 0 0 0        
Operating income 0 0 0 0        
Interest expense – third party 0 0 0 0        
Interest expense – affiliates 0 0 0 0        
Interest income – third party 0 0 0 0        
Net gain (loss) on forward and derivative contracts 0 0 0 0        
Gain on bargain purchase   0   0        
Loss on early extinguishment of debt   0   0        
Other income (expense) – net (82) 0 (82) 0        
Income (loss) before income taxes and equity in earnings (losses) of subsidiaries and joint ventures (82) 0 (82) 0        
Income tax expense 117 0 308 0        
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures 35 0 226 0        
Equity in earnings (losses) of subsidiaries and joint ventures (22,697) 32,428 (2,227) 26,397        
Net income (loss) (22,662) 32,428 (2,001) 26,397        
Other comprehensive income before income tax effect (420) (9,960) (963) (10,997)        
Income tax effect 549 349 1,246 731        
Other comprehensive income (loss) 129 (9,611) 283 (10,266)        
Comprehensive income (loss) (22,533) 22,817 (1,718) 16,131        
Financing activities:                
Cash and cash equivalents, beginning of period     0          
Cash and cash equivalents, end of period $ 0   $ 0