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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2012
Property, Plant and Equipment [Abstract]  
Components of property, plant and equipment
Property, plant and equipment, net is as follows:

   ($ in thousands)
June 30, 2012
December 31, 2011
    
    Property, plant and equipment
13,962,614
$
13,638,136
    Less:  Accumulated depreciation
(6,480,718
)
(6,090,613
)
         Property, plant and equipment, net
$
7,481,896
$
7,547,523