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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Total net gains (losses) included in earnings:        
Derivative instruments and carbon credits, gains and losses recognized in earnings $ (455) $ (631) $ (409) $ (1,080)
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings (255) (310) 16 (290)
Cost of Sales [Member] | Commodities Contracts [Member]
       
Total net gains (losses) included in earnings:        
Derivative instruments and carbon credits, gains and losses recognized in earnings (214) (43) (72) (194)
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings (209) (20) (208) (52)
Cost of Sales [Member] | Foreign Exchange Contracts [Member]
       
Total net gains (losses) included in earnings:        
Derivative instruments and carbon credits, gains and losses recognized in earnings (8) 6 (8) 46
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings (2)   (2)  
Other Income [Member] | Carbon Credits [Member]
       
Total net gains (losses) included in earnings:        
Derivative instruments and carbon credits, gains and losses recognized in earnings   990   1,030
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings   9   9
Other Expenses [Member] | Contractual obligations relating to carbon credits [Member]
       
Total net gains (losses) included in earnings:        
Derivative instruments and carbon credits, gains and losses recognized in earnings   (896)   (936)
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings   (7)   (7)
Interest Expense [Member] | Interest Rate Contracts [Member]
       
Total net gains (losses) included in earnings:        
Derivative instruments and carbon credits, gains and losses recognized in earnings (233) (688) (329) (1,026)
Derivative instruments and carbon credits change in unrealized gains and losses recognized in earnings $ (44) $ (292) $ 226 $ (240)