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Condensed consolidating financial information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 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 $ 52,498 $ 195,471    
Restricted cash 1,032   1,697  
Accounts receivable — net 45,619   56,184  
Due from affiliates 56,131   43,587  
Inventories 252,099   239,615  
Prepaid and other current assets 35,201   32,276  
Deferred taxes 13,614   13,614  
Total current assets 456,194   471,061  
Investment in subsidiaries 0   0  
Property, plant and equipment — net 1,239,893   1,247,661  
Due from affiliates — less current portion 0   0  
Other assets 90,768   91,474  
TOTAL 1,786,855   1,810,196  
Liabilities and shareholders' equity:        
Accounts payable, trade 99,975   108,490  
Due to affiliates 74,379   53,582  
Accrued and other current liabilities 51,644   69,466  
Accrued employee benefits costs 8,429   8,410  
Industrial revenue bonds 7,815   7,815  
Total current liabilities 242,242   247,763  
Senior notes payable 246,615   246,528  
Accrued pension benefit costs — less current portion 39,981   39,848  
Accrued postretirement benefits costs — less current portion 131,196   129,284  
Other liabilities/intercompany loan 36,984   37,743  
Deferred taxes 106,721   106,218  
Total noncurrent liabilities 561,497   559,621  
Shareholders' equity:        
Series A Preferred stock 1   1  
Common stock 936   935  
Additional paid-in capital 2,508,882   2,508,574  
Treasury stock, at cost (49,924)   (49,924)  
Accumulated other comprehensive loss (91,733) (150,297) (91,832) (151,192)
Retained earnings (accumulated deficit) (1,385,046)   (1,364,942)  
Total shareholders’ equity 983,116   1,002,812  
Total 1,786,855   1,810,196  
Net sales:        
Third-party customers 135,264 188,514    
Related parties 285,583 132,760    
Sales Revenue – net 420,847 321,274    
Cost of goods sold 422,605 303,692    
Gross profit (loss) (1,758) 17,582    
Other operating expense – net 2,414 1,096    
Selling, general and administrative expenses 10,062 16,299    
Operating income (loss) (14,234) 187    
Interest expense – third party (5,477) (6,076)    
Interest expense – affiliates 0 0    
Interest income – third party 140 131    
Net loss on forward and derivative contracts (879) 15,507    
Other income (expense) – net (253) 70    
Income before income taxes and equity in earnings (losses) of subsidiaries and joint ventures (20,703) 9,819    
Income tax benefit (expense) 1,094 (2,517)    
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures (19,609) 7,302    
Equity in earnings (losses) of subsidiaries and joint ventures (495) 951    
Net income (loss) (20,104) 8,253    
Other comprehensive income before income tax effect 812 1,277    
Income tax effect (713) (382)    
Other comprehensive income (loss) 99 895    
Comprehensive income (loss) (20,005) 9,148    
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS        
Net cash provided by (used in) operating activities (10,741) 22,401    
Purchase of property, plant and equipment (9,700) (9,364)    
Nordural expansion — Helguvik (93) (1,745)    
Purchase of carbon anode assets and improvements (5,724) (150)    
Proceeds from sale of property, plant and equipment 0 353    
Restricted and other cash deposits 665 0    
Net cash used in investing activities (14,852) (10,906)    
Financing activities:        
Borrowings under revolving credit facilities 18,870 0    
Repayments under revolving credit facilities (24,870) 0    
Intercompany transactions 0 0    
Issuance of common stock 3 0    
Net cash provided by (used in) financing activities (5,997) 0    
Change in cash and cash equivalents (31,590) 11,495    
Cash and cash equivalents, beginning of period 84,088 183,976    
Cash and cash equivalents, end of period 52,498 195,471    
Senior unsecured notes due August 15, 2014 [Member]
        
Guarantor Obligations [Line Items]        
Interest rate (in hundredths) 7.50%      
Combined Guarantor Subsidiaries [Member]
        
Assets:        
Cash and cash equivalents 0 0    
Restricted cash 787   787  
Accounts receivable — net 45,193   45,205  
Due from affiliates 282,130   303,031  
Inventories 168,081   166,137  
Prepaid and other current assets 6,210   6,350  
Deferred taxes 0   0  
Total current assets 502,401   521,510  
Investment in subsidiaries 55,558   55,929  
Property, plant and equipment — net 344,755   351,096  
Due from affiliates — less current portion 0   0  
Other assets 21,372   21,163  
TOTAL 924,086   949,698  
Liabilities and shareholders' equity:        
Accounts payable, trade 52,467   65,384  
Due to affiliates 2,025,679   2,015,550  
Accrued and other current liabilities 18,486   25,419  
Accrued employee benefits costs 6,589   12,880  
Industrial revenue bonds 7,815   7,815  
Total current liabilities 2,111,036   2,127,048  
Senior notes payable 0   0  
Accrued pension benefit costs — less current portion 12,603   6,183  
Accrued postretirement benefits costs — less current portion 126,123   124,466  
Other liabilities/intercompany loan 58,196   58,367  
Deferred taxes 0   0  
Total noncurrent liabilities 196,922   189,016  
Shareholders' equity:        
Series A Preferred stock 0   0  
Common stock 60   60  
Additional paid-in capital 268,468   268,467  
Treasury stock, at cost 0   0  
Accumulated other comprehensive loss (92,217)   (92,803)  
Retained earnings (accumulated deficit) (1,560,183)   (1,542,090)  
Total shareholders’ equity (1,383,872)   (1,366,366)  
Total 924,086   949,698  
Net sales:        
Third-party customers 135,252 137,098    
Related parties 164,040 66,629    
Sales Revenue – net 299,292 203,727    
Cost of goods sold 312,624 211,185    
Gross profit (loss) (13,332) (7,458)    
Other operating expense – net 2,414 1,096    
Selling, general and administrative expenses 9,371 12,889    
Operating income (loss) (25,117) (21,443)    
Interest expense – third party (5,419) (6,076)    
Interest expense – affiliates 12,461 14,496    
Interest income – third party 3 14    
Net loss on forward and derivative contracts (879) 15,507    
Other income (expense) – net (220) 119    
Income before income taxes and equity in earnings (losses) of subsidiaries and joint ventures (19,171) 2,617    
Income tax benefit (expense) 1,447 (7,102)    
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures (17,724) (4,485)    
Equity in earnings (losses) of subsidiaries and joint ventures (366) (2,222)    
Net income (loss) (18,090) (6,707)    
Other comprehensive income before income tax effect 590 1,084    
Income tax effect (705) (391)    
Other comprehensive income (loss) (115) 693    
Comprehensive income (loss) (18,205) (6,014)    
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS        
Net cash provided by (used in) operating activities (42,154) 27,968    
Purchase of property, plant and equipment (2,525) (1,723)    
Nordural expansion — Helguvik 0 0    
Purchase of carbon anode assets and improvements 0 0    
Proceeds from sale of property, plant and equipment   0    
Restricted and other cash deposits 0      
Net cash used in investing activities (2,525) (1,723)    
Financing activities:        
Borrowings under revolving credit facilities 0      
Repayments under revolving credit facilities 0      
Intercompany transactions 44,679 (26,245)    
Issuance of common stock 0      
Net cash provided by (used in) financing activities 44,679 (26,245)    
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    
Combined Non-Guarantor Subsidiaries [Member]
        
Assets:        
Cash and cash equivalents 48,605 121,660    
Restricted cash 245   910  
Accounts receivable — net 426   10,979  
Due from affiliates 33,567   36,995  
Inventories 85,390   73,478  
Prepaid and other current assets 17,702   20,531  
Deferred taxes 13,614   14,540  
Total current assets 199,549   195,410  
Investment in subsidiaries 0   0  
Property, plant and equipment — net 894,052   895,381  
Due from affiliates — less current portion 32,730   32,066  
Other assets 35,375   33,132  
TOTAL 1,161,706   1,155,989  
Liabilities and shareholders' equity:        
Accounts payable, trade 39,795   42,351  
Due to affiliates 115,888   97,351  
Accrued and other current liabilities 25,833   26,005  
Accrued employee benefits costs 0   0  
Industrial revenue bonds 0   0  
Total current liabilities 181,516   165,707  
Senior notes payable 0   0  
Accrued pension benefit costs — less current portion 0   0  
Accrued postretirement benefits costs — less current portion 0   0  
Other liabilities/intercompany loan 544,554   548,985  
Deferred taxes 106,721   106,218  
Total noncurrent liabilities 651,275   655,203  
Shareholders' equity:        
Series A Preferred stock 0   0  
Common stock 12   12  
Additional paid-in capital 175,943   179,493  
Treasury stock, at cost 0   0  
Accumulated other comprehensive loss (1,716)   (1,678)  
Retained earnings (accumulated deficit) 154,676   157,252  
Total shareholders’ equity 328,915   335,079  
Total 1,161,706   1,155,989  
Net sales:        
Third-party customers 12 51,416    
Related parties 121,543 66,131    
Sales Revenue – net 121,555 117,547    
Cost of goods sold 109,981 92,507    
Gross profit (loss) 11,574 25,040    
Other operating expense – net 0 0    
Selling, general and administrative expenses 691 3,410    
Operating income (loss) 10,883 21,630    
Interest expense – third party (58) 0    
Interest expense – affiliates (12,461) (14,496)    
Interest income – third party 137 117    
Net loss on forward and derivative contracts 0 0    
Other income (expense) – net (33) (49)    
Income before income taxes and equity in earnings (losses) of subsidiaries and joint ventures (1,532) 7,202    
Income tax benefit (expense) (544) 4,585    
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures (2,076) 11,787    
Equity in earnings (losses) of subsidiaries and joint ventures (495) 951    
Net income (loss) (2,571) 12,738    
Other comprehensive income before income tax effect (47) (47)    
Income tax effect 8 9    
Other comprehensive income (loss) (39) (38)    
Comprehensive income (loss) (2,610) 12,700    
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS        
Net cash provided by (used in) operating activities 31,413 (5,567)    
Purchase of property, plant and equipment (7,149) (7,494)    
Nordural expansion — Helguvik (93) (1,745)    
Purchase of carbon anode assets and improvements (5,724) (150)    
Proceeds from sale of property, plant and equipment   353    
Restricted and other cash deposits 665      
Net cash used in investing activities (12,301) (9,036)    
Financing activities:        
Borrowings under revolving credit facilities 0      
Repayments under revolving credit facilities (6,000)      
Intercompany transactions (2,484) 26,247    
Issuance of common stock 0      
Net cash provided by (used in) financing activities (8,484) 26,247    
Change in cash and cash equivalents 10,628 11,644    
Cash and cash equivalents, beginning of period 37,977 110,016    
Cash and cash equivalents, end of period 48,605 121,660    
The Company [Member]
        
Assets:        
Cash and cash equivalents 3,893 73,811    
Restricted cash 0   0  
Accounts receivable — net 0   0  
Due from affiliates 2,340,716   2,304,874  
Inventories 0   0  
Prepaid and other current assets 5,627   5,395  
Deferred taxes 0   0  
Total current assets 2,350,236   2,356,380  
Investment in subsidiaries (1,106,964)   (1,087,216)  
Property, plant and equipment — net 1,523   1,621  
Due from affiliates — less current portion 0   0  
Other assets 32,052   32,431  
TOTAL 1,276,847   1,303,216  
Liabilities and shareholders' equity:        
Accounts payable, trade 2,242   755  
Due to affiliates 0   0  
Accrued and other current liabilities 8,548   16,486  
Accrued employee benefits costs 1,840   2,737  
Industrial revenue bonds 0   0  
Total current liabilities 12,630   19,978  
Senior notes payable 246,615   246,528  
Accrued pension benefit costs — less current portion 27,378   26,458  
Accrued postretirement benefits costs — less current portion 5,073   4,818  
Other liabilities/intercompany loan 2,035   2,622  
Deferred taxes 0   0  
Total noncurrent liabilities 281,101   280,426  
Shareholders' equity:        
Series A Preferred stock 1   1  
Common stock 936   935  
Additional paid-in capital 2,508,882   2,508,574  
Treasury stock, at cost (49,924)   (49,924)  
Accumulated other comprehensive loss (91,733)   (91,832)  
Retained earnings (accumulated deficit) (1,385,046)   (1,364,942)  
Total shareholders’ equity 983,116   1,002,812  
Total 1,276,847   1,303,216  
Net sales:        
Third-party customers 0 0    
Related parties 0 0    
Sales Revenue – net 0 0    
Cost of goods sold 0 0    
Gross profit (loss) 0 0    
Other operating expense – net 0 0    
Selling, general and administrative expenses 0 0    
Operating income (loss) 0 0    
Interest expense – third party 0 0    
Interest expense – affiliates 0 0    
Interest income – third party 0 0    
Net loss on forward and derivative contracts 0 0    
Other income (expense) – net 0 0    
Income before income taxes and equity in earnings (losses) of subsidiaries and joint ventures 0 0    
Income tax benefit (expense) 0 0    
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures 0 0    
Equity in earnings (losses) of subsidiaries and joint ventures (20,104) 8,253    
Net income (loss) (20,104) 8,253    
Other comprehensive income before income tax effect 812 1,277    
Income tax effect (713) (382)    
Other comprehensive income (loss) 99 895    
Comprehensive income (loss) (20,005) 9,148    
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS        
Net cash provided by (used in) operating activities 0 0    
Purchase of property, plant and equipment (26) (147)    
Nordural expansion — Helguvik 0 0    
Purchase of carbon anode assets and improvements 0 0    
Proceeds from sale of property, plant and equipment   0    
Restricted and other cash deposits 0      
Net cash used in investing activities (26) (147)    
Financing activities:        
Borrowings under revolving credit facilities 18,870      
Repayments under revolving credit facilities (18,870)      
Intercompany transactions (42,195) (2)    
Issuance of common stock 3      
Net cash provided by (used in) financing activities (42,192) (2)    
Change in cash and cash equivalents (42,218) (149)    
Cash and cash equivalents, beginning of period 46,111 73,960    
Cash and cash equivalents, end of period 3,893 73,811    
Reclassifications and Eliminations [Member]
        
Assets:        
Cash and cash equivalents 0      
Restricted cash 0   0  
Accounts receivable — net 0   0  
Due from affiliates (2,600,282)   (2,601,313)  
Inventories (1,372)   0  
Prepaid and other current assets 5,662   0  
Deferred taxes 0   (926)  
Total current assets (2,595,992)   (2,602,239)  
Investment in subsidiaries 1,051,406   1,031,287  
Property, plant and equipment — net (437)   (437)  
Due from affiliates — less current portion (32,730)   (32,066)  
Other assets 1,969   4,748  
TOTAL (1,575,784)   (1,598,707)  
Liabilities and shareholders' equity:        
Accounts payable, trade 5,471   0  
Due to affiliates (2,067,188)   (2,059,319)  
Accrued and other current liabilities (1,223)   1,556  
Accrued employee benefits costs 0   (7,207)  
Industrial revenue bonds 0   0  
Total current liabilities (2,062,940)   (2,064,970)  
Senior notes payable 0   0  
Accrued pension benefit costs — less current portion 0   7,207  
Accrued postretirement benefits costs — less current portion 0   0  
Other liabilities/intercompany loan (567,801)   (572,231)  
Deferred taxes 0   0  
Total noncurrent liabilities (567,801)   (565,024)  
Shareholders' equity:        
Series A Preferred stock 0   0  
Common stock (72)   (72)  
Additional paid-in capital (444,411)   (447,960)  
Treasury stock, at cost 0   0  
Accumulated other comprehensive loss 93,933   94,481  
Retained earnings (accumulated deficit) 1,405,507   1,384,838  
Total shareholders’ equity 1,054,957   1,031,287  
Total (1,575,784)   (1,598,707)  
Net sales:        
Third-party customers 0 0    
Related parties 0 0    
Sales Revenue – net 0 0    
Cost of goods sold 0 0    
Gross profit (loss) 0 0    
Other operating expense – net 0 0    
Selling, general and administrative expenses 0 0    
Operating income (loss) 0 0    
Interest expense – third party 0 0    
Interest expense – affiliates 0 0    
Interest income – third party 0 0    
Net loss on forward and derivative contracts 0 0    
Other income (expense) – net 0 0    
Income before income taxes and equity in earnings (losses) of subsidiaries and joint ventures 0 0    
Income tax benefit (expense) 191 0    
Income (loss) before equity in earnings (losses) of subsidiaries and joint ventures 191 0    
Equity in earnings (losses) of subsidiaries and joint ventures 20,470 (6,031)    
Net income (loss) 20,661 (6,031)    
Other comprehensive income before income tax effect (543) (1,037)    
Income tax effect 697 382    
Other comprehensive income (loss) 154 (655)    
Comprehensive income (loss) 20,815 (6,686)    
Financing activities:        
Cash and cash equivalents, beginning of period 0      
Cash and cash equivalents, end of period $ 0