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Derivatives, Hedges, Financial Instruments and Carbon Credits (Tables)
 12 Months Ended
Dec. 31, 2011
Derivatives, Hedges, Financial Instruments and Carbon Credits [Abstract]  
Assets and liabilities measured at fair value on recurring basis
                                         
            Fair Value Measurements at        
            December 31, 2011 Using        
            Quoted Prices     Significant              
    Total Fair     in Active     Other     Significant     Total Fair  
    Value at     Markets for     Observable     Unobservable     Value at  
    December 31,     Identical Assets     Inputs     Inputs     December 31,  
    2011     (Level 1)     (Level 2)     (Level 3)     2010  
Description   (In Thousands)  
 
                                       
Assets — Supplies, prepaid items and other:
                                       
Commodities contracts
  $ 11     $ 11     $ —     $ —     $ 761  
Carbon credits
    42       —       —       42       644  
Foreign exchange contracts
    —       —       —       —       49  
 
                             
Total
  $ 53     $ 11     $ —     $ 42     $ 1,454  
 
                             
 
                                       
Liabilities — Current and noncurrent accrued and other liabilities:
                                       
Contractual obligations — carbon credits
  $ 42     $ —     $ —     $ 42     $ 644  
Interest rate contracts
    2,241       —       2,241       —       1,895  
 
                             
Total
  $ 2,283     $ —     $ 2,241     $ 42     $ 2,539  
 
                             
Reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
                                                 
    Assets     Liabilities  
    2011     2010     2009     2011     2010     2009  
    (In Thousands)  
Beginning balance
  $ 644     $ —     $ —     $ (644 )   $ —     $ (1,388 )
Transfers into Level 3
    —       —       —       —       —       —  
Transfers out of Level 3
    —       —       —       —       —       —  
Total realized and unrealized gains (losses) included in earnings
    1,995       644       —       (1,844 )     (644 )     493  
Purchases
    —       —       —       —       —       —  
Issuances
    —       —       —       —       —       —  
Sales
    (2,597 )     —       —       —       —       —  
Settlements
    —       —       —       2,446       —       895  
 
                                   
Ending balance
  $ 42     $ 644     $ —     $ (42 )   $ (644 )   $ —  
 
                                   
Total gains (losses) for the period included in earnings attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date
  $ 42     $ 644     $ —     $ (42 )   $ (644 )   $ —  
 
                                   
Realized and unrealized net losses included in earnings and the income statement
                         
    2011     2010     2009  
    (In Thousands)  
Total net gains (losses) included in earnings:
                       
Cost of sales — Commodities contracts
  $ (523 )   $ (59 )   $ (1,312 )
Cost of sales — Foreign exchange contracts
    46       25       (32 )
Other income — Carbon credits
    1,995       644       —  
Other expense — Contractual obligations relating to carbon credits
    (1,844 )     (644 )     —  
Interest expense — Interest rate contracts
    (1,925 )     (1,527 )     (729 )
 
                 
 
  $ (2,251 )   $ (1,561 )   $ (2,073 )
 
                 
 
                       
Change in unrealized gains (losses) relating to contracts still held at year end:
                       
Cost of sales — Commodities contracts
  $ 11     $ 761     $ 138  
Cost of sales — Foreign exchange contracts
    —       49       —  
Other income — Carbon credits
    42       644       —  
Other expense — Contractual obligations relating to carbon credits
    (42 )     (644 )     —  
Interest expense — Interest rate contracts
    (346 )     34       508  
 
                 
 
  $ (335 )   $ 844     $ 646  
 
                 
The estimated fair value and carrying value of long-term debt
                                 
    December 31, 2011     December 31, 2010  
    Estimated     Carrying     Estimated     Carrying  
    Fair Value     Value     Fair Value     Value  
    (In Thousands)  
Variable Interest Rate:
                               
Secured Term Loan (1)
  $ 72,188     $ 72,188     $ 26,721     $ 48,773  
Working Capital Revolver Loan
    —       —       —       —  
Other debt (2)
    —       —       2,437       2,437  
 
Fixed Interest Rate:
                               
5.5% Convertible Senior Subordinated Notes
    —       —       27,976       26,900  
Other bank debt and equipment financing
    7,211       7,272       17,251       17,282  
 
                       
 
  $ 79,399     $ 79,460     $ 74,385     $ 95,392  
 
                       
     
(1)  
Includes a fixed interest rate of 5.15% on the principal amount of $24.1 million at December 31, 2011.
 
(2)  
At December 31, 2010, the balance includes a variable interest rate debt agreement with a minimum interest rate of 6%, which interest rate was 6%.