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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