Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2012

Property, Plant and Equipment [Abstract]

Components of property, plant and equipment

Property, plant and equipment is as follows:

($ in thousands)	March 31, 2012			December 31, 2011
Property, plant and equipment	$	13,779,230		$	13,638,136
Less:  Accumulated depreciation		(6,278,081	)		(6,090,613	)
Property, plant and equipment, net	$	7,501,149		$	7,547,523