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Asset Retirement Obligations

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

12. ASSET RETIREMENT OBLIGATIONS

The following table provides a summary of changes in asset retirement obligations:


	Year Ended December 31,
thousands	2021		2020
Carrying amount of asset retirement obligations at beginning of year	$	280,498	$	358,868
Liabilities incurred	23,923		9,565
Liabilities settled	(12,710)		(20,418)
Accretion expense	12,664		15,070
Revisions in estimated liabilities	3,834		(82,587)
Carrying amount of asset retirement obligations at end of year	$	308,209	$	280,498

Revisions in estimated liabilities for the year ended December 31, 2020, primarily related to a reduction in expected settlement costs across several of the Partnership’s assets, with the largest decreases at the Third Creek gathering system, DJ Basin complex, Hilight system, and West Texas complex.