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Condensed consolidating financial information - Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents $ 117,593 $ 115,393 $ 122,976 $ 163,242
Restricted cash 1,046 791    
Accounts receivable - net 11,187 9,475    
Due from affiliates 14,271 17,417    
Inventories 233,288 231,872    
Prepaid and other current assets 31,828 42,412    
Assets held for sale 23,239 30,697    
Total current assets 432,452 448,057    
Property, plant and equipment - net 1,185,101 1,232,256    
Investment in subsidiaries 0 0    
Due from affiliates - less current portion 0 0    
Other assets 71,163 72,155    
TOTAL 1,688,716 1,752,468    
Accounts payable, trade 85,314 90,489    
Due to affiliates 13,105 10,045    
Accrued and other current liabilities 59,382 48,822    
Accrued employee benefits costs 9,284 10,148    
Industrial revenue bonds 7,815 7,815    
Total current liabilities 174,900 167,319    
Senior notes payable 247,590 247,278    
Accrued pension benefits costs cost - less current portion 42,433 43,999    
Accrued postretirement benefits costs - less current portion 125,490 125,999    
Other liabilities 72,330 53,009    
Intercompany loan 0 0    
Deferred taxes 88,449 96,994    
Total noncurrent liabilities 576,292 567,279    
Series A Preferred stock 1 1    
Common stock 942 942    
Additional paid-in capital 2,514,765 2,513,631    
Treasury stock, at cost (86,276) (86,276)    
Accumulated other comprehensive loss (110,179) (112,650)    
Accumulated deficit (1,381,729) (1,297,778)    
Total shareholders’ equity 937,524 1,017,870    
TOTAL 1,688,716 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 (2,837) (2,525)    
Prepaid and other current assets 0 0    
Assets held for sale 0 0    
Total current assets (2,837) (2,525)    
Property, plant and equipment - net 0 0    
Investment in subsidiaries (523,942) (593,604)    
Due from affiliates - less current portion (651,550) (632,170)    
Other assets 7,418 7,419    
TOTAL (1,170,911) (1,220,880)    
Accounts payable, trade 0 0    
Due to affiliates 3,065 0    
Accrued and other current liabilities 0 0    
Accrued employee benefits costs 0 0    
Industrial revenue bonds 0 0    
Total current liabilities 3,065 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 (656,926) (634,170)    
Deferred taxes 0 0    
Total noncurrent liabilities (649,508) (626,752)    
Series A Preferred stock 0 0    
Common stock (232,424) (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 2,081,512 1,859,457    
Total shareholders’ equity (524,468) (594,128)    
TOTAL (1,170,911) (1,220,880)    
The Company [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents 37,605 58,421 74,395 70,683
Restricted cash 0 0    
Accounts receivable - net 168 104    
Due from affiliates 353 13    
Inventories 180 180    
Prepaid and other current assets 7,265 7,713    
Assets held for sale 0 0    
Total current assets 45,571 66,431    
Property, plant and equipment - net 8,275 9,188    
Investment in subsidiaries 523,942 593,604    
Due from affiliates - less current portion 647,844 632,170    
Other assets 28,513 29,536    
TOTAL 1,254,145 1,330,929    
Accounts payable, trade 1,431 2,380    
Due to affiliates 574 2,143    
Accrued and other current liabilities 17,929 11,247    
Accrued employee benefits costs 1,066 1,824    
Industrial revenue bonds 0 0    
Total current liabilities 21,000 17,594    
Senior notes payable 247,590 247,278    
Accrued pension benefits costs cost - less current portion 39,048 39,831    
Accrued postretirement benefits costs - less current portion 5,161 4,524    
Other liabilities 3,298 3,307    
Intercompany loan 0 0    
Deferred taxes 0 0    
Total noncurrent liabilities 295,097 294,940    
Series A Preferred stock 1 1    
Common stock 942 942    
Additional paid-in capital 2,514,765 2,513,631    
Treasury stock, at cost (86,276) (86,276)    
Accumulated other comprehensive loss (13,922) (13,125)    
Accumulated deficit (1,477,462) (1,396,778)    
Total shareholders’ equity 938,048 1,018,395    
TOTAL 1,254,145 1,330,929    
Combined Guarantor Subsidiaries [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents (125) (3,647) (616) (1,187)
Restricted cash 790 791    
Accounts receivable - net 10,737 8,891    
Due from affiliates 13,918 14,493    
Inventories 138,287 148,280    
Prepaid and other current assets 4,231 16,242    
Assets held for sale 0 0    
Total current assets 167,838 185,050    
Property, plant and equipment - net 335,202 361,626    
Investment in subsidiaries 0 0    
Due from affiliates - less current portion 3,706 0    
Other assets 18,272 19,153    
TOTAL 525,018 565,829    
Accounts payable, trade 49,749 53,145    
Due to affiliates 8,679 7,167    
Accrued and other current liabilities 16,459 14,759    
Accrued employee benefits costs 7,558 7,644    
Industrial revenue bonds 7,815 7,815    
Total current liabilities 90,260 90,530    
Senior notes payable 0 0    
Accrued pension benefits costs cost - less current portion (10,919) (11,021)    
Accrued postretirement benefits costs - less current portion 118,724 119,911    
Other liabilities 32,143 30,505    
Intercompany loan 27,995 124,518    
Deferred taxes 0 0    
Total noncurrent liabilities 167,943 263,913    
Series A Preferred stock 0 0    
Common stock 1 0    
Additional paid-in capital 297,899 191,023    
Treasury stock, at cost 0 0    
Accumulated other comprehensive loss (57,694) (60,026)    
Accumulated deficit 26,609 80,389    
Total shareholders’ equity 266,815 211,386    
TOTAL 525,018 565,829    
Combined Non-Guarantor Subsidiaries [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash & cash equivalents 80,113 60,619 $ 49,197 $ 93,746
Restricted cash 256 0    
Accounts receivable - net 282 480    
Due from affiliates 0 2,911    
Inventories 97,658 85,937    
Prepaid and other current assets 20,332 18,457    
Assets held for sale 23,239 30,697    
Total current assets 221,880 199,101    
Property, plant and equipment - net 841,624 861,442    
Investment in subsidiaries 0 0    
Due from affiliates - less current portion 0 0    
Other assets 16,960 16,047    
TOTAL 1,080,464 1,076,590    
Accounts payable, trade 34,134 34,964    
Due to affiliates 787 735    
Accrued and other current liabilities 24,994 22,816    
Accrued employee benefits costs 660 680    
Industrial revenue bonds 0 0    
Total current liabilities 60,575 59,195    
Senior notes payable 0 0    
Accrued pension benefits costs cost - less current portion 14,304 15,189    
Accrued postretirement benefits costs - less current portion 1,605 1,564    
Other liabilities 29,471 11,779    
Intercompany loan 628,931 509,652    
Deferred taxes 88,449 96,994    
Total noncurrent liabilities 762,760 635,178    
Series A Preferred stock 0 0    
Common stock 232,423 224,424    
Additional paid-in capital 2,075,657 2,038,138    
Treasury stock, at cost 0 0    
Accumulated other comprehensive loss (38,563) (39,499)    
Accumulated deficit (2,012,388) (1,840,846)    
Total shareholders’ equity 257,129 382,217    
TOTAL $ 1,080,464 $ 1,076,590