Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation [Abstract]

Reconciliation of the company's asset retirement obligation

A reconciliation of the Company's liability, which the current portion is included in other accrued liabilities on the Consolidated Balance Sheets, for the years ended December 31 was as follows:

	2021		2020
	(In thousands)
Balance at beginning of year	$	446,919	$	417,575
Liabilities incurred	12,454		11,560
Liabilities acquired	1,805		1,378
Liabilities settled	(15,155)		(5,369)
Accretion expense*	21,214		21,668
Revisions in estimates	1,449		107
Balance at end of year	$	468,686	$	446,919

*Includes $19.6 million and $20.1 million in 2021 and 2020, respectively, recorded to regulatory assets.