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

($ in thousands)
 
September 30, 2012
   
December 31, 2011
   
                 
Property, plant and equipment
 
$
14,133,935
   
$
13,638,136
   
Less: Accumulated depreciation
   
(6,651,035
)
   
(6,090,613
)
 
Property, plant and equipment, net
 
$
7,482,900
   
$
7,547,523