Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Asset Retirement Obligations [Abstract]

Asset Retirement Obligation Rollforward Analysis

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 years ended December 31, 2012 and 2011 (in thousands):

			2012		2011
Carrying Amount at Beginning of Period		$	587,084	$	498,288
	Liabilities Incurred		107,378		68,703
	Liabilities Settled (1)		(77,384)		(66,129)
	Accretion		30,020		27,907
	Revisions		15,287		58,786
	Foreign Currency Translations		3,559		(471)
Carrying Amount at End of Period		$	665,944	$	587,084
Current Portion		$	30,127	$	29,527
Noncurrent Portion		$	635,817	$	557,557

(1)Includes settlements related to asset sales.