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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
Property, plant and equipment, net is as follows:

   ($ in thousands)
 
June 30, 2013
   
December 31, 2012
   
    
                 
    Property, plant and equipment
 
14,579,736
   
$
14,353,763
   
    Less:  Accumulated depreciation
   
(7,217,980
)
   
(6,848,867
)
 
         Property, plant and equipment, net
 
$
7,361,756
   
$
7,504,896