XML 97 R83.htm IDEA: XBRL DOCUMENT v3.22.0.1
Supplemental Balance Sheet Information - Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis    
Beginning asset retirement obligations $ 8,759 $ 8,936
Revisions to existing liabilities 0 918
Accretion expense 375 410
Liabilities settled (62) (1,505)
Ending asset retirement obligations 9,072 8,759
Current portion of asset retirement obligations (261) (1,692)
Long-term portion of asset retirement obligations $ 8,811 $ 7,067