XML 49 R39.htm IDEA: XBRL DOCUMENT v3.21.2
Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Summary of changes in asset retirement obligations
The following table provides a summary of the changes in the Company’s asset retirement obligations:
(in thousands)Amount
Balance at January 1, 2021$14,020 
Accretion expense1,165 
Balance at September 30, 2021$15,185