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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Liabilities - Current and noncurrent accrued and other liabilities:    
Total $ 2,013 $ 2,283
Recurring [Member]
    
Assets - Supplies, prepaid items and other:    
Total 195 53
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 2,013 2,283
Recurring [Member] | Commodities Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 153 11
Recurring [Member] | Carbon Credits [Member]
    
Assets - Supplies, prepaid items and other:    
Carbon credits 42 42
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 42 42
Recurring [Member] | Interest Rate Contracts [Member]
    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 1,971 2,241
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets - Supplies, prepaid items and other:    
Total 153  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total     
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets 153  
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Carbon Credits [Member]
    
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits     
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     
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets - Supplies, prepaid items and other:    
Total     
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 1,971  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodities Contracts [Member]
    
Assets - Supplies, prepaid items and other:    
Derivative Assets     
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Carbon Credits [Member]
    
Assets - Supplies, prepaid items and other:    
Carbon credits     
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 1,971  
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] | 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