Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 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)	June 30, 2011				December 31, 2010
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Long-term debt	$	7,988,813	$	8,361,160	$	7,983,693	$	8,376,515