Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2019

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 nine-month periods ended September 30, 2019 and 2018 (in thousands):

	Nine Months Ended September 30,
	2019			2018
Carrying Amount at January 1	$	954,377		$	946,848
Liabilities Incurred	78,025			63,443
Liabilities Settled (1)	(52,443		)	(15,319		)
Accretion	31,890			27,306
Revisions	71,145			(39,137		)
Foreign Currency Translations	154			(2,197		)
Carrying Amount at September 30	$	1,083,148		$	980,944
Current Portion	$	27,055		$	18,209
Noncurrent Portion	$	1,056,093		$	962,735

(1)

Includes settlements related to asset sales.