Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2011

Notes To Financial Statements [Abstract]

Asset Retirement Obligations

The following table presents the reconciliation of the beginning and ending aggregate carrying amounts of short-term and long-term legal obligations associated with the retirement of property, plant and equipment for the nine-month periods ended September 30, 2011 and 2010 (in thousands):

			Nine Months Ended
			September 30,
			2011		2010
Carrying Amount at Beginning of Period		$	498,288	$	456,484
	Liabilities Incurred		45,754		27,439
	Liabilities Settled (1)		(58,084)		(21,653)
	Accretion		20,125		19,105
	Revisions		61,668		53,824
	Foreign Currency Translations		(3,688)		1,980
Carrying Amount at End of Period		$	564,063	$	537,179
Current Portion		$	30,306	$	28,767
Noncurrent Portion		$	533,757	$	508,412

(1) Includes settlements related to asset sales.