Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes in Asset Retirement Obligation

The following table documents the changes in the Company’s asset retirement obligation during the years ended December 31 (dollars in thousands):

	2021			2020			2019
Asset retirement obligation at beginning of year	$	17,194		$	20,338		$	18,266
Liabilities incurred		825			(2,315	)		2,699
Liabilities settled		(1,541	)		(1,645	)		(1,503	)
Accretion expense		664			816			876
Asset retirement obligation at end of year	$	17,142		$	17,194		$	20,338