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Condensed consolidating financial information - Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ASSETS        
Cash and cash equivalents $ 167,211 $ 132,403 $ 115,393 $ 163,242
Restricted cash 848 1,050    
Accounts receivable - net 43,071 12,432    
Due from affiliates 10,366 16,651    
Inventories 317,469 233,563    
Prepaid and other current assets 14,709 22,210    
Assets held for sale 0 22,313    
Total current assets 553,674 440,622    
Property, plant and equipment - net 971,916 1,026,285    
Investment in subsidiaries 0 0    
Due from affiliates - less current portion 0 0    
Other assets 56,051 73,420    
TOTAL 1,581,641 1,540,327 1,752,468  
LIABILITIES:        
Accounts payable, trade 89,931 94,960    
Due to affiliates 20,369 15,368    
Accrued and other current liabilities 61,398 50,100    
Accrued employee benefits costs 11,004 10,917    
Industrial revenue bonds 7,815 7,815    
Total current liabilities 190,517 179,160    
Senior notes payable 248,153 247,699    
Accrued pension benefits costs - less current portion 38,929 49,493    
Accrued postretirement benefits costs - less current portion 112,996 126,355    
Other liabilities 57,927 72,026    
Intercompany loan 0 0    
Deferred taxes 103,476 108,939    
Total noncurrent liabilities 561,481 604,512    
SHAREHOLDERS’ EQUITY:        
Preferred stock 1 1    
Common stock 947 944    
Other shareholders' equity 828,695 755,710    
Total shareholder's equity 829,643 756,655 1,008,811 1,096,068
TOTAL 1,581,641 1,540,327    
Reportable Legal Entities [Member] | The Company [Member]        
ASSETS        
Cash and cash equivalents 64,384 36,670 58,421 70,683
Restricted cash 0 0    
Accounts receivable - net 0 167    
Due from affiliates 42 42    
Inventories 181 180    
Prepaid and other current assets 3,330 6,838    
Assets held for sale   0    
Total current assets 67,937 43,897    
Property, plant and equipment - net 19,381 12,311    
Investment in subsidiaries 751,820 702,659    
Due from affiliates - less current portion 513,328 529,873    
Other assets 27,954 28,215    
TOTAL 1,380,420 1,316,955    
LIABILITIES:        
Accounts payable, trade 6,297 6,125    
Due to affiliates 421 417    
Accrued and other current liabilities 15,973 11,950    
Accrued employee benefits costs 1,917 1,932    
Industrial revenue bonds 0 0    
Total current liabilities 24,608 20,424    
Senior notes payable 248,153 247,699    
Accrued pension benefits costs - less current portion 39,462 46,390    
Accrued postretirement benefits costs - less current portion 879 4,380    
Other liabilities 3,523 4,160    
Intercompany loan 234,137 237,247    
Deferred taxes 15 0    
Total noncurrent liabilities 526,169 539,876    
SHAREHOLDERS’ EQUITY:        
Preferred stock 1 1    
Common stock 947 944    
Other shareholders' equity 828,695 755,710    
Total shareholder's equity 829,643 756,655    
TOTAL 1,380,420 1,316,955    
Reportable Legal Entities [Member] | Combined Guarantor Subsidiaries [Member]        
ASSETS        
Cash and cash equivalents (132) (255) (3,647) (1,187)
Restricted cash 801 794    
Accounts receivable - net 42,792 11,883    
Due from affiliates 10,312 16,606    
Inventories 205,156 146,689    
Prepaid and other current assets 754 5,699    
Assets held for sale   0    
Total current assets 259,683 181,416    
Property, plant and equipment - net 295,865 328,069    
Investment in subsidiaries 53,942 51,240    
Due from affiliates - less current portion 349,572 346,893    
Other assets 34,162 49,331    
TOTAL 993,224 956,949    
LIABILITIES:        
Accounts payable, trade 51,394 52,921    
Due to affiliates 2,563 9,641    
Accrued and other current liabilities 19,301 17,744    
Accrued employee benefits costs 8,263 8,317    
Industrial revenue bonds 7,815 7,815    
Total current liabilities 89,336 96,438    
Senior notes payable 0 0    
Accrued pension benefits costs - less current portion 18,303 20,167    
Accrued postretirement benefits costs - less current portion 110,394 120,242    
Other liabilities 31,991 30,920    
Intercompany loan 53,812 42,609    
Deferred taxes 1,748 2,735    
Total noncurrent liabilities 216,248 216,673    
SHAREHOLDERS’ EQUITY:        
Preferred stock 0 0    
Common stock 1 1    
Other shareholders' equity 687,639 643,837    
Total shareholder's equity 687,640 643,838    
TOTAL 993,224 956,949    
Reportable Legal Entities [Member] | Combined Non-Guarantor Subsidiaries [Member]        
ASSETS        
Cash and cash equivalents 102,959 95,988 60,619 93,746
Restricted cash 47 256    
Accounts receivable - net 279 382    
Due from affiliates 12 3    
Inventories 112,132 86,694    
Prepaid and other current assets 10,625 9,673    
Assets held for sale   22,313    
Total current assets 226,054 215,309    
Property, plant and equipment - net 656,670 685,905    
Investment in subsidiaries 0 0    
Due from affiliates - less current portion 9,430 1,792    
Other assets 25,915 27,596    
TOTAL 918,069 930,602    
LIABILITIES:        
Accounts payable, trade 32,240 35,914    
Due to affiliates 17,385 5,310    
Accrued and other current liabilities 26,124 20,406    
Accrued employee benefits costs 824 668    
Industrial revenue bonds 0 0    
Total current liabilities 76,573 62,298    
Senior notes payable 0 0    
Accrued pension benefits costs - less current portion 13,144 14,658    
Accrued postretirement benefits costs - less current portion 1,723 1,733    
Other liabilities 22,413 36,946    
Intercompany loan 584,381 598,702    
Deferred taxes 101,713 106,204    
Total noncurrent liabilities 723,374 758,243    
SHAREHOLDERS’ EQUITY:        
Preferred stock 0 0    
Common stock 59 59    
Other shareholders' equity 118,063 110,002    
Total shareholder's equity 118,122 110,061    
TOTAL 918,069 930,602    
Consolidating Adjustments [Member]        
ASSETS        
Cash and 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 (805,762) (753,899)    
Due from affiliates - less current portion (872,330) (878,558)    
Other assets (31,980) (31,722)    
TOTAL (1,710,072) (1,664,179)    
LIABILITIES:        
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 (31,980) (31,722)    
Accrued postretirement benefits costs - less current portion 0 0    
Other liabilities 0 0    
Intercompany loan (872,330) (878,558)    
Deferred taxes 0 0    
Total noncurrent liabilities (904,310) (910,280)    
SHAREHOLDERS’ EQUITY:        
Preferred stock 0 0    
Common stock (60) (60)    
Other shareholders' equity (805,702) (753,839)    
Total shareholder's equity (805,762) (753,899)    
TOTAL $ (1,710,072) $ (1,664,179)