Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2020

Asset Retirement Obligation [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 three-month periods ended March 31, 2020 and 2019 (in thousands):

	Three Months Ended March 31,
	2020			2019
Carrying Amount at January 1	$	1,110,710		$	954,377
Liabilities Incurred	15,573			15,360
Liabilities Settled (1)	(24,430		)	(24,709		)
Accretion	11,404			10,193
Revisions	(64		)	(9,704		)
Foreign Currency Translations	(388		)	112
Carrying Amount at March 31	$	1,112,805		$	945,629
Current Portion	$	37,641		$	26,182
Noncurrent Portion	$	1,075,164		$	919,447

(1)

Includes settlements related to asset sales.