Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2019

Asset Retirement Obligations [Abstract]

Summary of Changes in Asset Retirement Obligations

	Year Ended December 31,
(in thousands)	2019		2018			2017
Beginning balance	$	14,816	$	20,163	$	18,612
Accretion		812		1,180		951
Additions		595		—		—
Acquisitions and dispositions		—		—		(103)
Revisions		(379)		(6,527)		703
Ending balance	$	15,844	$	14,816	$	20,163