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Condensed consolidating financial information - Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 167,211 | $ 132,403 | $ 115,393 | $ 163,242
Restricted cash | 848 | 1,050 |  |
Accounts receivable - net | 43,071 | 12,432 |  |
Due from affiliates | 10,366 | 16,651 |  |
Inventories | 317,469 | 233,563 |  |
Prepaid and other current assets | 14,709 | 22,210 |  |
Assets held for sale | 0 | 22,313 |  |
Total current assets | 553,674 | 440,622 |  |
Property, plant and equipment - net | 971,916 | 1,026,285 |  |
Investment in subsidiaries | 0 | 0 |  |
Due from affiliates - less current portion | 0 | 0 |  |
Other assets | 56,051 | 73,420 |  |
TOTAL | 1,581,641 | 1,540,327 | 1,752,468 |
LIABILITIES: |  |  |  |
Accounts payable, trade | 89,931 | 94,960 |  |
Due to affiliates | 20,369 | 15,368 |  |
Accrued and other current liabilities | 61,398 | 50,100 |  |
Accrued employee benefits costs | 11,004 | 10,917 |  |
Industrial revenue bonds | 7,815 | 7,815 |  |
Total current liabilities | 190,517 | 179,160 |  |
Senior notes payable | 248,153 | 247,699 |  |
Accrued pension benefits costs - less current portion | 38,929 | 49,493 |  |
Accrued postretirement benefits costs - less current portion | 112,996 | 126,355 |  |
Other liabilities | 57,927 | 72,026 |  |
Intercompany loan | 0 | 0 |  |
Deferred taxes | 103,476 | 108,939 |  |
Total noncurrent liabilities | 561,481 | 604,512 |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 1 | 1 |  |
Common stock | 947 | 944 |  |
Other shareholders' equity | 828,695 | 755,710 |  |
Total shareholder's equity | 829,643 | 756,655 | 1,008,811 | 1,096,068
TOTAL | 1,581,641 | 1,540,327 |  |
Reportable Legal Entities [Member] | The Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 64,384 | 36,670 | 58,421 | 70,683
Restricted cash | 0 | 0 |  |
Accounts receivable - net | 0 | 167 |  |
Due from affiliates | 42 | 42 |  |
Inventories | 181 | 180 |  |
Prepaid and other current assets | 3,330 | 6,838 |  |
Assets held for sale |  | 0 |  |
Total current assets | 67,937 | 43,897 |  |
Property, plant and equipment - net | 19,381 | 12,311 |  |
Investment in subsidiaries | 751,820 | 702,659 |  |
Due from affiliates - less current portion | 513,328 | 529,873 |  |
Other assets | 27,954 | 28,215 |  |
TOTAL | 1,380,420 | 1,316,955 |  |
LIABILITIES: |  |  |  |
Accounts payable, trade | 6,297 | 6,125 |  |
Due to affiliates | 421 | 417 |  |
Accrued and other current liabilities | 15,973 | 11,950 |  |
Accrued employee benefits costs | 1,917 | 1,932 |  |
Industrial revenue bonds | 0 | 0 |  |
Total current liabilities | 24,608 | 20,424 |  |
Senior notes payable | 248,153 | 247,699 |  |
Accrued pension benefits costs - less current portion | 39,462 | 46,390 |  |
Accrued postretirement benefits costs - less current portion | 879 | 4,380 |  |
Other liabilities | 3,523 | 4,160 |  |
Intercompany loan | 234,137 | 237,247 |  |
Deferred taxes | 15 | 0 |  |
Total noncurrent liabilities | 526,169 | 539,876 |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 1 | 1 |  |
Common stock | 947 | 944 |  |
Other shareholders' equity | 828,695 | 755,710 |  |
Total shareholder's equity | 829,643 | 756,655 |  |
TOTAL | 1,380,420 | 1,316,955 |  |
Reportable Legal Entities [Member] | Combined Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | (132) | (255) | (3,647) | (1,187)
Restricted cash | 801 | 794 |  |
Accounts receivable - net | 42,792 | 11,883 |  |
Due from affiliates | 10,312 | 16,606 |  |
Inventories | 205,156 | 146,689 |  |
Prepaid and other current assets | 754 | 5,699 |  |
Assets held for sale |  | 0 |  |
Total current assets | 259,683 | 181,416 |  |
Property, plant and equipment - net | 295,865 | 328,069 |  |
Investment in subsidiaries | 53,942 | 51,240 |  |
Due from affiliates - less current portion | 349,572 | 346,893 |  |
Other assets | 34,162 | 49,331 |  |
TOTAL | 993,224 | 956,949 |  |
LIABILITIES: |  |  |  |
Accounts payable, trade | 51,394 | 52,921 |  |
Due to affiliates | 2,563 | 9,641 |  |
Accrued and other current liabilities | 19,301 | 17,744 |  |
Accrued employee benefits costs | 8,263 | 8,317 |  |
Industrial revenue bonds | 7,815 | 7,815 |  |
Total current liabilities | 89,336 | 96,438 |  |
Senior notes payable | 0 | 0 |  |
Accrued pension benefits costs - less current portion | 18,303 | 20,167 |  |
Accrued postretirement benefits costs - less current portion | 110,394 | 120,242 |  |
Other liabilities | 31,991 | 30,920 |  |
Intercompany loan | 53,812 | 42,609 |  |
Deferred taxes | 1,748 | 2,735 |  |
Total noncurrent liabilities | 216,248 | 216,673 |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 0 | 0 |  |
Common stock | 1 | 1 |  |
Other shareholders' equity | 687,639 | 643,837 |  |
Total shareholder's equity | 687,640 | 643,838 |  |
TOTAL | 993,224 | 956,949 |  |
Reportable Legal Entities [Member] | Combined Non-Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 102,959 | 95,988 | 60,619 | 93,746
Restricted cash | 47 | 256 |  |
Accounts receivable - net | 279 | 382 |  |
Due from affiliates | 12 | 3 |  |
Inventories | 112,132 | 86,694 |  |
Prepaid and other current assets | 10,625 | 9,673 |  |
Assets held for sale |  | 22,313 |  |
Total current assets | 226,054 | 215,309 |  |
Property, plant and equipment - net | 656,670 | 685,905 |  |
Investment in subsidiaries | 0 | 0 |  |
Due from affiliates - less current portion | 9,430 | 1,792 |  |
Other assets | 25,915 | 27,596 |  |
TOTAL | 918,069 | 930,602 |  |
LIABILITIES: |  |  |  |
Accounts payable, trade | 32,240 | 35,914 |  |
Due to affiliates | 17,385 | 5,310 |  |
Accrued and other current liabilities | 26,124 | 20,406 |  |
Accrued employee benefits costs | 824 | 668 |  |
Industrial revenue bonds | 0 | 0 |  |
Total current liabilities | 76,573 | 62,298 |  |
Senior notes payable | 0 | 0 |  |
Accrued pension benefits costs - less current portion | 13,144 | 14,658 |  |
Accrued postretirement benefits costs - less current portion | 1,723 | 1,733 |  |
Other liabilities | 22,413 | 36,946 |  |
Intercompany loan | 584,381 | 598,702 |  |
Deferred taxes | 101,713 | 106,204 |  |
Total noncurrent liabilities | 723,374 | 758,243 |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 0 | 0 |  |
Common stock | 59 | 59 |  |
Other shareholders' equity | 118,063 | 110,002 |  |
Total shareholder's equity | 118,122 | 110,061 |  |
TOTAL | 918,069 | 930,602 |  |
Consolidating Adjustments [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Restricted cash | 0 | 0 |  |
Accounts receivable - net | 0 | 0 |  |
Due from affiliates | 0 | 0 |  |
Inventories | 0 | 0 |  |
Prepaid and other current assets | 0 | 0 |  |
Assets held for sale |  | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment - net | 0 | 0 |  |
Investment in subsidiaries | (805,762) | (753,899) |  |
Due from affiliates - less current portion | (872,330) | (878,558) |  |
Other assets | (31,980) | (31,722) |  |
TOTAL | (1,710,072) | (1,664,179) |  |
LIABILITIES: |  |  |  |
Accounts payable, trade | 0 | 0 |  |
Due to affiliates | 0 | 0 |  |
Accrued and other current liabilities | 0 | 0 |  |
Accrued employee benefits costs | 0 | 0 |  |
Industrial revenue bonds | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Senior notes payable | 0 | 0 |  |
Accrued pension benefits costs - less current portion | (31,980) | (31,722) |  |
Accrued postretirement benefits costs - less current portion | 0 | 0 |  |
Other liabilities | 0 | 0 |  |
Intercompany loan | (872,330) | (878,558) |  |
Deferred taxes | 0 | 0 |  |
Total noncurrent liabilities | (904,310) | (910,280) |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 0 | 0 |  |
Common stock | (60) | (60) |  |
Other shareholders' equity | (805,702) | (753,839) |  |
Total shareholder's equity | (805,762) | (753,899) |  |
TOTAL | $ (1,710,072) | $ (1,664,179) |  |

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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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