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Condensed consolidating financial information - Balance Sheets (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |  |  |
Cash and cash equivalents | $ 125,895 | $ 132,403 | $ 126,461 | $ 115,393 | $ 163,242 | $ 84,088
Restricted cash | 797 | 1,050 |  | 791 |  |
Accounts receivable - net | 36,225 | 12,432 |  | 9,475 |  |
Due from affiliates | 11,789 | 16,651 |  | 17,417 |  |
Inventories | 244,720 | 233,563 |  | 231,872 |  |
Prepaid and other current assets | 18,968 | 22,210 |  | 42,412 |  |
Assets held for sale | 0 | 22,313 |  | 30,697 |  |
Total current assets | 438,394 | 440,622 |  | 448,057 |  |
Property, plant and equipment - net | 1,012,564 | 1,026,285 |  | 1,232,256 |  |
Investment in subsidiaries | 0 | 0 |  | 0 |  |
Due from affiliates - less current portion | 0 | 0 |  | 0 |  |
Other assets | 74,849 | 73,420 |  | 72,155 |  |
TOTAL | 1,525,807 | 1,540,327 |  | 1,752,468 | 2,025,058 |
Accounts payable, trade | 88,701 | 94,960 |  | 90,489 |  |
Due to affiliates | 20,020 | 15,368 |  | 10,045 |  |
Accrued and other current liabilities | 58,094 | 50,100 |  | 48,822 |  |
Accrued employee benefits costs | 10,914 | 10,917 |  | 10,148 |  |
Industrial revenue bonds | 7,815 | 7,815 |  | 7,815 |  |
Total current liabilities | 185,544 | 179,160 |  | 167,319 |  |
Senior notes payable | 247,809 | 247,699 |  | 247,278 |  |
Accrued pension benefits costs - less current portion | 48,863 | 49,493 |  | 43,999 |  |
Accrued postretirement benefits costs - less current portion | 126,729 | 126,355 |  | 125,999 |  |
Other liabilities | 64,608 | 72,026 |  | 53,009 |  |
Intercompany loan | 0 | 0 |  | 0 |  |
Deferred taxes | 109,510 | 108,939 |  | 106,053 |  |
Total noncurrent liabilities | 597,519 | 604,512 |  | 576,338 |  |
Series A Preferred stock | 1 | 1 |  | 1 |  |
Common stock | 944 | 944 |  | 942 |  |
Other shareholder's equity | 741,799 | 755,710 |  | 1,007,868 |  |
Total shareholders’ equity | 742,744 | 756,655 |  | 1,008,811 | 1,096,068 | 993,753
TOTAL | 1,525,807 | 1,540,327 |  | 1,752,468 |  |
Consolidating Adjustments [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0 | 0 | 0
Restricted cash | 0 | 0 |  | 0 |  |
Accounts receivable - net | 0 | 0 |  | 0 |  |
Due from affiliates | 0 | 0 |  | 0 |  |
Inventories | 0 | 0 |  | (2,525) |  |
Prepaid and other current assets | 0 | 0 |  | 0 |  |
Assets held for sale |  | 0 |  | 0 |  |
Total current assets | 0 | 0 |  | (2,525) |  |
Property, plant and equipment - net | 0 | 0 |  | 0 |  |
Investment in subsidiaries | (745,561) | (753,899) |  | (593,604) |  |
Due from affiliates - less current portion | (851,168) | (878,558) |  | (632,170) |  |
Other assets | (31,791) | (31,722) |  | 7,419 |  |
TOTAL | (1,628,520) | (1,664,179) |  | (1,220,880) |  |
Accounts payable, trade | 0 | 0 |  | 0 |  |
Due to affiliates | 0 | 0 |  | 0 |  |
Accrued and other current liabilities | 0 | 0 |  | 0 |  |
Accrued employee benefits costs | 0 | 0 |  | 0 |  |
Industrial revenue bonds | 0 | 0 |  | 0 |  |
Total current liabilities | 0 | 0 |  | 0 |  |
Senior notes payable | 0 | 0 |  | 0 |  |
Accrued pension benefits costs - less current portion | (31,791) | (31,722) |  | 0 |  |
Accrued postretirement benefits costs - less current portion | 0 | 0 |  | 0 |  |
Other liabilities | 0 | 0 |  | 7,418 |  |
Intercompany loan | (851,168) | (878,558) |  | (634,170) |  |
Deferred taxes | 0 | 0 |  | 0 |  |
Total noncurrent liabilities | (882,959) | (910,280) |  | (626,752) |  |
Series A Preferred stock | 0 | 0 |  | 0 |  |
Common stock | (60) | (60) |  | (224,424) |  |
Other shareholder's equity | (745,501) | (753,839) |  | (369,704) |  |
Total shareholders’ equity | (745,561) | (753,899) |  | (594,128) |  |
TOTAL | (1,628,520) | (1,664,179) |  | (1,220,880) |  |
The Company [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Cash and cash equivalents | 39,218 | 36,670 | 49,667 | 58,421 | 70,683 | 47,274
Restricted cash | 0 | 0 |  | 0 |  |
Accounts receivable - net | 0 | 167 |  | 104 |  |
Due from affiliates | 42 | 42 |  | 13 |  |
Inventories | 180 | 180 |  | 180 |  |
Prepaid and other current assets | 6,909 | 6,838 |  | 7,713 |  |
Assets held for sale |  | 0 |  | 0 |  |
Total current assets | 46,349 | 43,897 |  | 66,431 |  |
Property, plant and equipment - net | 14,379 | 12,311 |  | 9,188 |  |
Investment in subsidiaries | 693,468 | 702,659 |  | 593,604 |  |
Due from affiliates - less current portion | 511,577 | 529,873 |  | 632,170 |  |
Other assets | 28,754 | 28,215 |  | 29,536 |  |
TOTAL | 1,294,527 | 1,316,955 |  | 1,330,929 |  |
Accounts payable, trade | 4,404 | 6,125 |  | 2,380 |  |
Due to affiliates | 2,637 | 417 |  | 2,143 |  |
Accrued and other current liabilities | 13,825 | 11,950 |  | 11,247 |  |
Accrued employee benefits costs | 1,932 | 1,932 |  | 1,824 |  |
Industrial revenue bonds | 0 | 0 |  | 0 |  |
Total current liabilities | 22,798 | 20,424 |  | 17,594 |  |
Senior notes payable | 247,809 | 247,699 |  | 247,278 |  |
Accrued pension benefits costs - less current portion | 46,136 | 46,390 |  | 39,831 |  |
Accrued postretirement benefits costs - less current portion | 4,476 | 4,380 |  | 4,524 |  |
Other liabilities | 4,499 | 4,160 |  | 3,307 |  |
Intercompany loan | 226,065 | 237,247 |  | 0 |  |
Deferred taxes | 0 | 0 |  | 0 |  |
Total noncurrent liabilities | 528,985 | 539,876 |  | 294,940 |  |
Series A Preferred stock | 1 | 1 |  | 1 |  |
Common stock | 944 | 944 |  | 942 |  |
Other shareholder's equity | 741,799 | 755,710 |  | 1,017,452 |  |
Total shareholders’ equity | 742,744 | 756,655 |  | 1,018,395 |  |
TOTAL | 1,294,527 | 1,316,955 |  | 1,330,929 |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Cash and cash equivalents | (24) | (255) | (74) | (3,647) | (1,187) | (1,158)
Restricted cash | 797 | 794 |  | 791 |  |
Accounts receivable - net | 35,999 | 11,883 |  | 8,891 |  |
Due from affiliates | 11,747 | 16,606 |  | 14,493 |  |
Inventories | 155,056 | 146,689 |  | 148,280 |  |
Prepaid and other current assets | 2,795 | 5,699 |  | 16,242 |  |
Assets held for sale |  | 0 |  | 0 |  |
Total current assets | 206,370 | 181,416 |  | 185,050 |  |
Property, plant and equipment - net | 320,527 | 328,069 |  | 361,626 |  |
Investment in subsidiaries | 52,093 | 51,240 |  | 0 |  |
Due from affiliates - less current portion | 325,392 | 346,893 |  | 0 |  |
Other assets | 49,249 | 49,331 |  | 19,153 |  |
TOTAL | 953,631 | 956,949 |  | 565,829 |  |
Accounts payable, trade | 49,249 | 52,921 |  | 53,145 |  |
Due to affiliates | 11,475 | 9,641 |  | 7,167 |  |
Accrued and other current liabilities | 24,422 | 17,744 |  | 14,759 |  |
Accrued employee benefits costs | 8,314 | 8,317 |  | 7,644 |  |
Industrial revenue bonds | 7,815 | 7,815 |  | 7,815 |  |
Total current liabilities | 101,275 | 96,438 |  | 90,530 |  |
Senior notes payable | 0 | 0 |  | 0 |  |
Accrued pension benefits costs - less current portion | 20,211 | 20,167 |  | (11,021) |  |
Accrued postretirement benefits costs - less current portion | 120,502 | 120,242 |  | 119,911 |  |
Other liabilities | 31,146 | 30,920 |  | 30,505 |  |
Intercompany loan | 43,364 | 42,609 |  | 124,518 |  |
Deferred taxes | 2,735 | 2,735 |  | 0 |  |
Total noncurrent liabilities | 217,958 | 216,673 |  | 263,913 |  |
Series A Preferred stock | 0 | 0 |  | 0 |  |
Common stock | 1 | 1 |  | 0 |  |
Other shareholder's equity | 634,397 | 643,837 |  | 211,386 |  |
Total shareholders’ equity | 634,398 | 643,838 |  | 211,386 |  |
TOTAL | 953,631 | 956,949 |  | 565,829 |  |
Combined Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Cash and cash equivalents | 86,701 | 95,988 | $ 76,868 | 60,619 | $ 93,746 | $ 37,972
Restricted cash | 0 | 256 |  | 0 |  |
Accounts receivable - net | 226 | 382 |  | 480 |  |
Due from affiliates | 0 | 3 |  | 2,911 |  |
Inventories | 89,484 | 86,694 |  | 85,937 |  |
Prepaid and other current assets | 9,264 | 9,673 |  | 18,457 |  |
Assets held for sale |  | 22,313 |  | 30,697 |  |
Total current assets | 185,675 | 215,309 |  | 199,101 |  |
Property, plant and equipment - net | 677,658 | 685,905 |  | 861,442 |  |
Investment in subsidiaries | 0 | 0 |  | 0 |  |
Due from affiliates - less current portion | 14,199 | 1,792 |  | 0 |  |
Other assets | 28,637 | 27,596 |  | 16,047 |  |
TOTAL | 906,169 | 930,602 |  | 1,076,590 |  |
Accounts payable, trade | 35,048 | 35,914 |  | 34,964 |  |
Due to affiliates | 5,908 | 5,310 |  | 735 |  |
Accrued and other current liabilities | 19,847 | 20,406 |  | 22,816 |  |
Accrued employee benefits costs | 668 | 668 |  | 680 |  |
Industrial revenue bonds | 0 | 0 |  | 0 |  |
Total current liabilities | 61,471 | 62,298 |  | 59,195 |  |
Senior notes payable | 0 | 0 |  | 0 |  |
Accrued pension benefits costs - less current portion | 14,307 | 14,658 |  | 15,189 |  |
Accrued postretirement benefits costs - less current portion | 1,751 | 1,733 |  | 1,564 |  |
Other liabilities | 28,963 | 36,946 |  | 11,779 |  |
Intercompany loan | 581,739 | 598,702 |  | 509,652 |  |
Deferred taxes | 106,775 | 106,204 |  | 106,053 |  |
Total noncurrent liabilities | 733,535 | 758,243 |  | 644,237 |  |
Series A Preferred stock | 0 | 0 |  | 0 |  |
Common stock | 59 | 59 |  | 224,424 |  |
Other shareholder's equity | 111,104 | 110,002 |  | 148,734 |  |
Total shareholders’ equity | 111,163 | 110,061 |  | 373,158 |  |
TOTAL | $ 906,169 | $ 930,602 |  | $ 1,076,590 |  |

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