Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value of Financial Instruments [Abstract]

Fair Value of Financial Instruments

The fair value of our long-term debt is estimated based on quoted market prices at the reporting date for those financial instruments.

($ in thousands)	September 30, 2011		December 31, 2010
	Carrying		Carrying
	Amount	Fair Value	Amount	Fair Value
Long-term debt	$  8,151,081	$  8,023,443	$  7,983,614	$    8,376,515