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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
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):
 
2019
 
2018
 
2017
Asset retirement obligation at beginning of year
$
18,266

 
$
17,482

 
$
15,515

Liabilities incurred
2,699

 
—

 
1,171

Liabilities settled
(1,503
)
 
(66
)
 
—

Accretion expense
876

 
850

 
796

Asset retirement obligation at end of year
$
20,338

 
$
18,266

 
$
17,482