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Condensed consolidating financial information - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents $ 126,461 $ 115,393 $ 226,431 $ 163,242
Restricted cash 795 791    
Accounts receivable - net 12,668 9,475    
Due from affiliates 15,478 17,417    
Inventories 220,502 231,872    
Prepaid and other current assets 29,622 42,412    
Assets held for sale 29,715 30,697    
Total current assets 435,241 448,057    
Property, plant and equipment - net 1,215,222 1,232,256    
Investment in subsidiaries 0 0    
Due from affiliates - less current portion 0 0    
Other assets 73,142 72,155    
TOTAL 1,723,605 1,752,468    
Accounts payable, trade 84,587 90,489    
Due to affiliates 6,173 10,045    
Accrued and other current liabilities 50,169 48,822    
Accrued employee benefits costs 10,054 10,148    
Industrial revenue bonds 7,815 7,815    
Total current liabilities 158,798 167,319    
Senior notes payable 247,380 247,278    
Accrued pension benefits costs cost - less current portion 43,437 43,999    
Accrued postretirement benefits costs - less current portion 125,941 125,999    
Other liabilities 51,799 53,009    
Intercompany loan 0 0    
Deferred taxes 93,399 96,994    
Total noncurrent liabilities 561,956 567,279    
Series A Preferred stock 1 1    
Common stock 942 942    
Additional paid-in capital 2,513,952 2,513,631    
Treasury stock, at cost (86,276) (86,276)    
Accumulated other comprehensive loss (111,827) (112,650)    
Accumulated deficit (1,313,941) (1,297,778)    
Total shareholders’ equity 1,002,851 1,017,870    
TOTAL 1,723,605 1,752,468    
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 (2,274) (2,525)    
Prepaid and other current assets 0 0    
Assets held for sale 0 0    
Total current assets (2,274) (2,525)    
Property, plant and equipment - net 0 0    
Investment in subsidiaries (580,999) (593,604)    
Due from affiliates - less current portion (639,780) (632,170)    
Other assets 7,418 7,419    
TOTAL (1,215,635) (1,220,880)    
Accounts payable, trade 0 0    
Due to affiliates 2,916 0    
Accrued and other current liabilities 0 0    
Accrued employee benefits costs 0 0    
Industrial revenue bonds 0 0    
Total current liabilities 2,916 0    
Senior notes payable 0 0    
Accrued pension benefits costs cost - less current portion 0 0    
Accrued postretirement benefits costs - less current portion 0 0    
Other liabilities 7,418 7,418    
Intercompany loan (644,696) (634,170)    
Deferred taxes 0 0    
Total noncurrent liabilities (637,278) (626,752)    
Series A Preferred stock 0 0    
Common stock (228,424) (224,424)    
Additional paid-in capital (2,373,556) (2,229,161)    
Treasury stock, at cost 0 0    
Accumulated other comprehensive loss 0 0    
Accumulated deficit 2,020,707 1,859,457    
Total shareholders’ equity (581,273) (594,128)    
TOTAL (1,215,635) (1,220,880)    
The Company [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents 49,667 58,421 164,075 70,683
Restricted cash 0 0    
Accounts receivable - net 0 104    
Due from affiliates 382 13    
Inventories 180 180    
Prepaid and other current assets 7,073 7,713    
Assets held for sale 0 0    
Total current assets 57,302 66,431    
Property, plant and equipment - net 8,863 9,188    
Investment in subsidiaries 580,999 593,604    
Due from affiliates - less current portion 639,780 632,170    
Other assets 30,025 29,536    
TOTAL 1,316,969 1,330,929    
Accounts payable, trade 2,582 2,380    
Due to affiliates 1,500 2,143    
Accrued and other current liabilities 14,280 11,247    
Accrued employee benefits costs 1,824 1,824    
Industrial revenue bonds 0 0    
Total current liabilities 20,186 17,594    
Senior notes payable 247,380 247,278    
Accrued pension benefits costs cost - less current portion 39,552 39,831    
Accrued postretirement benefits costs - less current portion 4,834 4,524    
Other liabilities 1,893 3,307    
Intercompany loan 0 0    
Deferred taxes 0 0    
Total noncurrent liabilities 293,659 294,940    
Series A Preferred stock 1 1    
Common stock 942 942    
Additional paid-in capital 2,513,952 2,513,631    
Treasury stock, at cost (86,276) (86,276)    
Accumulated other comprehensive loss (13,391) (13,125)    
Accumulated deficit (1,412,104) (1,396,778)    
Total shareholders’ equity 1,003,124 1,018,395    
TOTAL 1,316,969 1,330,929    
Combined Guarantor Subsidiaries [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents (74) (3,647) (64) (1,187)
Restricted cash 795 791    
Accounts receivable - net 12,088 8,891    
Due from affiliates 13,955 14,493    
Inventories 142,070 148,280    
Prepaid and other current assets 4,290 16,242    
Assets held for sale 0 0    
Total current assets 173,124 185,050    
Property, plant and equipment - net 352,384 361,626    
Investment in subsidiaries 0 0    
Due from affiliates - less current portion 0 0    
Other assets 19,328 19,153    
TOTAL 544,836 565,829    
Accounts payable, trade 47,777 53,145    
Due to affiliates 1,210 7,167    
Accrued and other current liabilities 11,073 14,759    
Accrued employee benefits costs 7,550 7,644    
Industrial revenue bonds 7,815 7,815    
Total current liabilities 75,425 90,530    
Senior notes payable 0 0    
Accrued pension benefits costs cost - less current portion (11,009) (11,021)    
Accrued postretirement benefits costs - less current portion 119,529 119,911    
Other liabilities 30,749 30,505    
Intercompany loan 126,343 124,518    
Deferred taxes 0 0    
Total noncurrent liabilities 265,612 263,913    
Series A Preferred stock 0 0    
Common stock 0 0    
Additional paid-in capital 191,023 191,023    
Treasury stock, at cost 0 0    
Accumulated other comprehensive loss (59,249) (60,026)    
Accumulated deficit 72,025 80,389    
Total shareholders’ equity 203,799 211,386    
TOTAL 544,836 565,829    
Combined Non-Guarantor Subsidiaries [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents 76,868 60,619 $ 62,420 $ 93,746
Restricted cash 0 0    
Accounts receivable - net 580 480    
Due from affiliates 1,141 2,911    
Inventories 80,526 85,937    
Prepaid and other current assets 18,259 18,457    
Assets held for sale 29,715 30,697    
Total current assets 207,089 199,101    
Property, plant and equipment - net 853,975 861,442    
Investment in subsidiaries 0 0    
Due from affiliates - less current portion 0 0    
Other assets 16,371 16,047    
TOTAL 1,077,435 1,076,590    
Accounts payable, trade 34,228 34,964    
Due to affiliates 547 735    
Accrued and other current liabilities 24,816 22,816    
Accrued employee benefits costs 680 680    
Industrial revenue bonds 0 0    
Total current liabilities 60,271 59,195    
Senior notes payable 0 0    
Accrued pension benefits costs cost - less current portion 14,894 15,189    
Accrued postretirement benefits costs - less current portion 1,578 1,564    
Other liabilities 11,739 11,779    
Intercompany loan 518,353 509,652    
Deferred taxes 93,399 96,994    
Total noncurrent liabilities 639,963 635,178    
Series A Preferred stock 0 0    
Common stock 228,424 224,424    
Additional paid-in capital 2,182,533 2,038,138    
Treasury stock, at cost 0 0    
Accumulated other comprehensive loss (39,187) (39,499)    
Accumulated deficit (1,994,569) (1,840,846)    
Total shareholders’ equity 377,201 382,217    
TOTAL $ 1,077,435 $ 1,076,590