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Property, Plant and Equipment (Details 1) (USD $)
In Thousands
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Reconciliation of property, plant and equipment    
Property, plant and equipment additions $ 201,981 $ 230,825
Net change in related accounts payable and deposits 22,648 (87,897)
Purchases of property, plant, and equipment $ 224,629 $ 142,928