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Cash flow information (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flow information [Abstract]    
Interest, net of amount capitalized $ 35,893 $ 40,646
Income taxes, net 2,418 12,887
Property, plant and equipment additions in accounts payable $ 76,505 $ 24,991