Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2022

Asset Retirement Obligation Disclosure [Abstract]

Schedule of change in asset retirement obligation

ur overall asset retirement obligation changed as follows:

	Year Ended December 31,
	2022		2021
	(Thousands)
Beginning balance	$	122,650	$	95,777
Accretion	6,656		5,725
Changes in estimates of existing obligations (1)	—		21,148
Ending balance	$	129,306	$	122,650

(1)Changes in estimates of existing obligations are primarily due to the annual review process, which considers various factors including inflation rate, current estimates for removal costs, discount rates, and the estimated remaining life of assets. The increase in 2021 is primarily due to a decrease in the discount rate and an increase in the estimated life of the ARO assets.