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Cash flow information (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]    
Interest, net of amount capitalized $ 60,281 $ 57,956
Income taxes paid 30,262 3,210
Property, plant and equipment additions in accounts payable $ 85,646 $ 68,636