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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Liabilities - Current and noncurrent accrued and other liabilities:    
Total $ 2,283 $ 2,539
Recurring [Member]
    
Assets - Supplies, prepaid items and other:    
Total 53 1,454
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 2,283 2,539
Recurring [Member] | Commodities Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 11 761
Recurring [Member] | Carbon Credits [Member]
    
Assets - Supplies, prepaid items and other:    
Carbon credits 42 644
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 42 644
Recurring [Member] | Foreign Exchange Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 0 49
Recurring [Member] | Interest Rate Contracts [Member]
    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 2,241 1,895
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets - Supplies, prepaid items and other:    
Total 11  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 0  
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 11  
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Carbon Credits [Member]
    
Assets - Supplies, prepaid items and other:    
Carbon credits 0  
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 0  
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Exchange Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 0  
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member]
    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 0  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets - Supplies, prepaid items and other:    
Total 0  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 2,241  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodities Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 0  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Carbon Credits [Member]
    
Assets - Supplies, prepaid items and other:    
Carbon credits 0  
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 0  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 0  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 2,241  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Assets - Supplies, prepaid items and other:    
Total 42  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 42  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodities Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 0  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Carbon Credits [Member]
    
Assets - Supplies, prepaid items and other:    
Carbon credits 42  
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 42  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 0  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member]
    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities $ 0