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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following tables present the details of AROs which are included on the accompanying Consolidated Balance Sheets in Other deferred credits and other liabilities (in thousands):
December 31, 2020Liabilities IncurredLiabilities SettledAccretionRevisions to Prior EstimatesDecember 31, 2021
Electric Utilities$29,157 $— $(978)$1,315 $595 $30,089 
Gas Utilities (a)
42,274 — (66)1,733 1,514 45,455 
Total71,431 $— $(1,044)$3,048 $2,109 $75,544 

December 31, 2019Liabilities IncurredLiabilities SettledAccretionRevisions to Prior EstimatesDecember 31, 2020
Electric Utilities (b) (c)
$28,120 $1,217 $(185)$1,230 $(1,225)$29,157 
Gas Utilities (d)
36,085 4,782 (132)1,539 — 42,274 
Total$64,205 $5,999 $(317)$2,769 $(1,225)$71,431 
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(a)    The Revisions to Prior Estimates were primarily driven by changes in estimates associated with natural gas wells.
(b)    Liabilities incurred were related to new wind assets.
(c)    The Revisions to Prior Estimates were primarily driven by changes in estimated costs associated with back-filling the pit with overburden removed during the mining process.
(d)    Liabilities incurred were driven by an increase in gas pipeline miles; which increases our legal liability for retirement of gas pipelines, specifically to purge and cap these lines in accordance with federal regulations.