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Condensed consolidating financial information - Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents $ 130,673 $ 132,403 $ 129,384 $ 115,393
Restricted cash 855 1,050    
Accounts receivable - net 42,473 12,432    
Due from affiliates 10,495 16,651    
Inventories 254,611 233,563    
Prepaid and other current assets 18,624 22,210    
Assets held for sale 0 22,313    
Total current assets 457,731 440,622    
Property, plant and equipment - net 1,000,503 1,026,285    
Investment in subsidiaries 0 0    
Due from affiliates - long term 0 0    
Other assets 67,395 73,420    
TOTAL 1,525,629 1,540,327    
Accounts payable, trade 92,131 94,960    
Due to affiliates 19,092 15,368    
Accrued and other current liabilities 45,679 50,100    
Accrued employee benefits costs 10,767 10,917    
Industrial revenue bonds 7,815 7,815    
Total current liabilities 175,484 179,160    
Senior notes payable 247,922 247,699    
Accrued pension benefits costs - less current portion 47,601 49,493    
Accrued postretirement benefits costs - less current portion 128,033 126,355    
Due to affiliates - long term 0      
Other liabilities 66,840 72,026    
Intercompany loan   0    
Deferred taxes 108,988 108,939    
Total noncurrent liabilities 599,384 604,512    
Preferred stock 1 1    
Common stock 945 944    
Other shareholders' equity 749,815 755,710    
Total shareholders’ equity 750,761 756,655    
Liabilities and Equity 1,525,629 1,540,327    
Consolidating Adjustments [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & 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 (758,293) (753,899)    
Due from affiliates - long term (931,185) (878,558)    
Other assets (31,851) (31,722)    
TOTAL (1,721,329) (1,664,179)    
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 (31,851) (31,722)    
Accrued postretirement benefits costs - less current portion 0 0    
Due to affiliates - long term (931,185)      
Other liabilities 0 0    
Intercompany loan   (878,558)    
Deferred taxes 0 0    
Total noncurrent liabilities (963,036) (910,280)    
Preferred stock 0 0    
Common stock (60) (60)    
Other shareholders' equity (758,233) (753,839)    
Total shareholders’ equity (758,293) (753,899)    
Liabilities and Equity (1,721,329) (1,664,179)    
The Company [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents 29,305 36,670 47,316 58,421
Restricted cash 0 0    
Accounts receivable - net 0 167    
Due from affiliates 42 42    
Inventories 180 180    
Prepaid and other current assets 6,269 6,838    
Assets held for sale   0    
Total current assets 35,796 43,897    
Property, plant and equipment - net 17,015 12,311    
Investment in subsidiaries 704,533 702,659    
Due from affiliates - long term 528,232 529,873    
Other assets 28,175 28,215    
TOTAL 1,313,751 1,316,955    
Accounts payable, trade 2,823 6,125    
Due to affiliates 133 417    
Accrued and other current liabilities 10,569 11,950    
Accrued employee benefits costs 1,932 1,932    
Industrial revenue bonds 0 0    
Total current liabilities 15,457 20,424    
Senior notes payable 247,922 247,699    
Accrued pension benefits costs - less current portion 45,857 46,390    
Accrued postretirement benefits costs - less current portion 3,805 4,380    
Due to affiliates - long term 243,668      
Other liabilities 6,281 4,160    
Intercompany loan   237,247    
Deferred taxes 0 0    
Total noncurrent liabilities 547,533 539,876    
Preferred stock 1 1    
Common stock 945 944    
Other shareholders' equity 749,815 755,710    
Total shareholders’ equity 750,761 756,655    
Liabilities and Equity 1,313,751 1,316,955    
Combined Guarantor Subsidiaries [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents (270) (255) (278) (3,647)
Restricted cash 800 794    
Accounts receivable - net 42,252 11,883    
Due from affiliates 10,453 16,606    
Inventories 159,857 146,689    
Prepaid and other current assets 2,669 5,699    
Assets held for sale   0    
Total current assets 215,761 181,416    
Property, plant and equipment - net 313,307 328,069    
Investment in subsidiaries 53,760 51,240    
Due from affiliates - long term 389,099 346,893    
Other assets 44,012 49,331    
TOTAL 1,015,939 956,949    
Accounts payable, trade 52,886 52,921    
Due to affiliates 8,409 9,641    
Accrued and other current liabilities 14,557 17,744    
Accrued employee benefits costs 8,256 8,317    
Industrial revenue bonds 7,815 7,815    
Total current liabilities 91,923 96,438    
Senior notes payable 0 0    
Accrued pension benefits costs - less current portion 19,746 20,167    
Accrued postretirement benefits costs - less current portion 122,556 120,242    
Due to affiliates - long term 101,441      
Other liabilities 31,640 30,920    
Intercompany loan   42,609    
Deferred taxes 2,720 2,735    
Total noncurrent liabilities 278,103 216,673    
Preferred stock 0 0    
Common stock 1 1    
Other shareholders' equity 645,912 643,837    
Total shareholders’ equity 645,913 643,838    
Liabilities and Equity 1,015,939 956,949    
Combined Non-Guarantor Subsidiaries [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents 101,638 95,988 $ 82,346 $ 60,619
Restricted cash 55 256    
Accounts receivable - net 221 382    
Due from affiliates 0 3    
Inventories 94,574 86,694    
Prepaid and other current assets 9,686 9,673    
Assets held for sale   22,313    
Total current assets 206,174 215,309    
Property, plant and equipment - net 670,181 685,905    
Investment in subsidiaries 0 0    
Due from affiliates - long term 13,854 1,792    
Other assets 27,059 27,596    
TOTAL 917,268 930,602    
Accounts payable, trade 36,422 35,914    
Due to affiliates 10,550 5,310    
Accrued and other current liabilities 20,553 20,406    
Accrued employee benefits costs 579 668    
Industrial revenue bonds 0 0    
Total current liabilities 68,104 62,298    
Senior notes payable 0 0    
Accrued pension benefits costs - less current portion 13,849 14,658    
Accrued postretirement benefits costs - less current portion 1,672 1,733    
Due to affiliates - long term 586,076      
Other liabilities 28,919 36,946    
Intercompany loan   598,702    
Deferred taxes 106,268 106,204    
Total noncurrent liabilities 736,784 758,243    
Preferred stock 0 0    
Common stock 59 59    
Other shareholders' equity 112,321 110,002    
Total shareholders’ equity 112,380 110,061    
Liabilities and Equity $ 917,268 $ 930,602