Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Schedule of asset retirement obligations

The following table describes the changes in our AROs (in thousands):

	2021		2020		2019
AROs at January 1,	$	30,913	$	28,258	$	—
Liability incurred during the period		—		—		53,294
Liability settled during the period		—		—		(28,296)
Revisions in estimates		(2,631)		—		822
Accretion expense		1,376		2,655		2,438
AROs at December 31,	$	29,658	$	30,913	$	28,258