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Condensed consolidating financial information - Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 115,393 | $ 163,242 | $ 84,088 | $ 183,976
Restricted cash | 791 | 801 |  |
Accounts receivable — net | 9,475 | 77,667 |  |
Due from affiliates | 17,417 | 31,503 |  |
Inventories | 231,872 | 283,480 |  |
Prepaid and other current assets | 42,412 | 29,768 |  |
Deferred taxes | 0 | 14,281 |  |
Assets held for sale | 30,697 | 0 |  |
Total current assets | 448,057 | 600,742 |  |
Property, plant and equipment — net | 1,232,256 | 1,305,543 |  |
Investment in subsidiaries | 0 | 0 |  |
Due from affiliates - less current portion | 0 | 0 |  |
Other assets | 72,155 | 118,773 |  |
TOTAL | 1,752,468 | 2,025,058 | 1,810,196 |
Accounts payable, trade | 90,489 | 151,443 |  |
Due to affiliates | 10,045 | 22,261 |  |
Accrued and other current liabilities | 48,822 | 103,807 |  |
Accrued employee benefits costs | 10,148 | 10,159 |  |
Industrial revenue bonds | 7,815 | 7,815 |  |
Total current liabilities | 167,319 | 295,485 |  |
Senior notes payable | 247,278 | 246,888 |  |
Accrued pension benefits costs — less current portion | 43,999 | 59,906 |  |
Accrued postretirement benefits costs — less current portion | 125,999 | 152,894 |  |
Other liabilities | 53,009 | 53,272 |  |
Intercompany loan | 0 | 0 |  |
Deferred taxes | 96,994 | 111,486 |  |
Total noncurrent liabilities | 567,279 | 624,446 |  |
Series A Preferred stock | 1 | 1 |  |
Common stock | 942 | 939 |  |
Additional paid-in capital | 2,513,631 | 2,510,261 |  |
Treasury stock, at cost | (86,276) | (49,924) |  |
Accumulated other comprehensive loss | (112,650) | (117,682) | (91,832) | (151,192)
Retained Earnings (Accumulated Deficit) | (1,297,778) | (1,238,468) |  |
Total shareholders’ equity | 1,017,870 | 1,105,127 | 1,002,812 | 982,643
TOTAL | 1,752,468 | 2,025,058 |  |
The Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents | 58,421 | 70,683 | 47,274 | 74,656
Restricted cash | 0 | 0 |  |
Accounts receivable — net | 104 | 0 |  |
Due from affiliates | 13 | 9 |  |
Inventories | 180 | 180 |  |
Prepaid and other current assets | 7,713 | 4,311 |  |
Deferred taxes |  | 0 |  |
Assets held for sale | 0 |  |  |
Total current assets | 66,431 | 75,183 |  |
Property, plant and equipment — net | 9,188 | 1,788 |  |
Investment in subsidiaries | 593,604 | 589,532 |  |
Due from affiliates - less current portion | 632,170 | 719,258 |  |
Other assets | 29,536 | 31,233 |  |
TOTAL | 1,330,929 | 1,416,994 |  |
Accounts payable, trade | 2,380 | 2,252 |  |
Due to affiliates | 2,143 | 0 |  |
Accrued and other current liabilities | 11,247 | 13,048 |  |
Accrued employee benefits costs | 1,824 | 1,823 |  |
Industrial revenue bonds | 0 | 0 |  |
Total current liabilities | 17,594 | 17,123 |  |
Senior notes payable | 247,278 | 246,888 |  |
Accrued pension benefits costs — less current portion | 39,831 | 32,136 |  |
Accrued postretirement benefits costs — less current portion | 4,524 | 5,821 |  |
Other liabilities | 3,307 | 3,630 |  |
Intercompany loan | 0 | 0 |  |
Deferred taxes | 0 | 0 |  |
Total noncurrent liabilities | 294,940 | 288,475 |  |
Series A Preferred stock | 1 | 1 |  |
Common stock | 942 | 939 |  |
Additional paid-in capital | 2,513,631 | 2,510,261 |  |
Treasury stock, at cost | (86,276) | (49,924) |  |
Accumulated other comprehensive loss | (13,125) | (4,484) |  |
Retained Earnings (Accumulated Deficit) | (1,396,778) | (1,345,397) |  |
Total shareholders’ equity | 1,018,395 | 1,111,396 |  |
TOTAL | 1,330,929 | 1,416,994 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents | (3,647) | (1,187) | (1,158) | (687)
Restricted cash | 791 | 787 |  |
Accounts receivable — net | 8,891 | 77,173 |  |
Due from affiliates | 14,493 | 30,126 |  |
Inventories | 148,280 | 192,803 |  |
Prepaid and other current assets | 16,242 | 10,199 |  |
Deferred taxes |  | 14,281 |  |
Assets held for sale | 0 |  |  |
Total current assets | 185,050 | 324,182 |  |
Property, plant and equipment — net | 361,626 | 380,234 |  |
Investment in subsidiaries | 0 | 0 |  |
Due from affiliates - less current portion | 0 | 0 |  |
Other assets | 19,153 | 33,422 |  |
TOTAL | 565,829 | 737,838 |  |
Accounts payable, trade | 53,145 | 109,376 |  |
Due to affiliates | 7,167 | 18,730 |  |
Accrued and other current liabilities | 14,759 | 64,104 |  |
Accrued employee benefits costs | 7,644 | 7,805 |  |
Industrial revenue bonds | 7,815 | 7,815 |  |
Total current liabilities | 90,530 | 207,830 |  |
Senior notes payable | 0 | 0 |  |
Accrued pension benefits costs — less current portion | (11,021) | 13,942 |  |
Accrued postretirement benefits costs — less current portion | 119,911 | 145,267 |  |
Other liabilities | 30,505 | 32,035 |  |
Intercompany loan | 124,518 | 164,610 |  |
Deferred taxes | 0 | 0 |  |
Total noncurrent liabilities | 263,913 | 355,854 |  |
Series A Preferred stock | 0 | 0 |  |
Common stock | 0 | 0 |  |
Additional paid-in capital | 191,023 | 150,861 |  |
Treasury stock, at cost | 0 | 0 |  |
Accumulated other comprehensive loss | (60,026) | (74,780) |  |
Retained Earnings (Accumulated Deficit) | 80,389 | 98,073 |  |
Total shareholders’ equity | 211,386 | 174,154 |  |
TOTAL | 565,829 | 737,838 |  |
Combined Non-Guarantor Subsidiaries [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents | 60,619 | 93,746 | 37,972 | 110,007
Restricted cash | 0 | 14 |  |
Accounts receivable — net | 480 | 494 |  |
Due from affiliates | 2,911 | 1,368 |  |
Inventories | 85,937 | 80,194 |  |
Prepaid and other current assets | 18,457 | 13,393 |  |
Deferred taxes |  | 0 |  |
Assets held for sale | 30,697 |  |  |
Total current assets | 199,101 | 189,209 |  |
Property, plant and equipment — net | 861,442 | 923,961 |  |
Investment in subsidiaries | 0 | 0 |  |
Due from affiliates - less current portion | 0 | 0 |  |
Other assets | 16,047 | 48,553 |  |
TOTAL | 1,076,590 | 1,161,723 |  |
Accounts payable, trade | 34,964 | 38,124 |  |
Due to affiliates | 735 | 3,531 |  |
Accrued and other current liabilities | 22,816 | 22,817 |  |
Accrued employee benefits costs | 680 | 531 |  |
Industrial revenue bonds | 0 | 0 |  |
Total current liabilities | 59,195 | 65,003 |  |
Senior notes payable | 0 | 0 |  |
Accrued pension benefits costs — less current portion | 15,189 | 13,828 |  |
Accrued postretirement benefits costs — less current portion | 1,564 | 1,806 |  |
Other liabilities | 11,779 | 11,963 |  |
Intercompany loan | 509,652 | 542,259 |  |
Deferred taxes | 96,994 | 111,486 |  |
Total noncurrent liabilities | 635,178 | 681,342 |  |
Series A Preferred stock | 0 | 0 |  |
Common stock | 224,424 | 215,424 |  |
Additional paid-in capital | 2,038,138 | 2,136,138 |  |
Treasury stock, at cost | 0 | 0 |  |
Accumulated other comprehensive loss | (39,499) | (38,418) |  |
Retained Earnings (Accumulated Deficit) | (1,840,846) | (1,897,766) |  |
Total shareholders’ equity | 382,217 | 415,378 |  |
TOTAL | 1,076,590 | 1,161,723 |  |
Consolidating Adjustments [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Restricted cash | 0 | 0 |  |
Accounts receivable — net | 0 | 0 |  |
Due from affiliates | 0 | 0 |  |
Inventories | (2,525) | 10,303 |  |
Prepaid and other current assets | 0 | 1,865 |  |
Deferred taxes |  | 0 |  |
Assets held for sale | 0 |  |  |
Total current assets | (2,525) | 12,168 |  |
Property, plant and equipment — net | 0 | (440) |  |
Investment in subsidiaries | (593,604) | (589,532) |  |
Due from affiliates - less current portion | (632,170) | (719,258) |  |
Other assets | 7,419 | 5,565 |  |
TOTAL | (1,220,880) | (1,291,497) |  |
Accounts payable, trade | 0 | 1,691 |  |
Due to affiliates | 0 | 0 |  |
Accrued and other current liabilities | 0 | 3,838 |  |
Accrued employee benefits costs | 0 | 0 |  |
Industrial revenue bonds | 0 | 0 |  |
Total current liabilities | 0 | 5,529 |  |
Senior notes payable | 0 | 0 |  |
Accrued pension benefits costs — less current portion | 0 | 0 |  |
Accrued postretirement benefits costs — less current portion | 0 | 0 |  |
Other liabilities | 7,418 | 5,644 |  |
Intercompany loan | (634,170) | (706,869) |  |
Deferred taxes | 0 | 0 |  |
Total noncurrent liabilities | (626,752) | (701,225) |  |
Series A Preferred stock | 0 | 0 |  |
Common stock | (224,424) | (215,424) |  |
Additional paid-in capital | (2,229,161) | (2,286,999) |  |
Treasury stock, at cost | 0 | 0 |  |
Accumulated other comprehensive loss | 0 | 0 |  |
Retained Earnings (Accumulated Deficit) | 1,859,457 | 1,906,622 |  |
Total shareholders’ equity | (594,128) | (595,801) |  |
TOTAL | $ (1,220,880) | $ (1,291,497) |  |

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- Definition Carrying value as of the balance sheet date of the long-term debt associated with industrial revenue bonds. For classified balance sheets, these bonds are considered current assets because they are remarketed weekly and the bonds could be required to be repaid upon demand if there is a failed remarketing. + References No definition available. + Details
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