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Selected Balance Sheet Information (Tables)
 6 Months Ended
Jun. 30, 2022
Selected Balance Sheet Information [Abstract]  
Account Receivable Schedule
Following is a summary of Accounts receivable, net included in the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:

June 30, 2022December 31, 2021
Billed Accounts Receivable$188,649 $181,027 
Unbilled Revenue81,647 142,738 
Less: Allowance for Credit Losses(3,193)(2,113)
Accounts Receivable, net$267,103 $321,652 
Financing Receivable, Current, Allowance for Credit Loss
Changes to allowance for credit losses for the six months ended June 30, 2022 and 2021, respectively, were as follows (in thousands):

Balance at Beginning of YearAdditions Charged to Costs and ExpensesRecoveries and Other AdditionsWrite-offs and Other Deductions
Balance at June 30,
2022$2,113 $4,239 $1,266 $(4,425)$3,193 
2021$7,003 $1,510 $1,786 $(4,270)$6,029 
Materials, Supplies, and Fuel Schedule
The following amounts by major classification are included in Materials, supplies and fuel on the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:

June 30, 2022December 31, 2021
Materials and supplies$91,736 $86,400 
Fuel - Electric Utilities2,169 1,267 
Natural gas in storage58,959 63,312 
Total materials, supplies and fuel$152,864 $150,979 
Accrued Liabilities Schedule
The following amounts by major classification are included in Accrued liabilities on the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:

June 30, 2022December 31, 2021
Accrued employee compensation, benefits and withholdings$64,417 $74,387 
Accrued property taxes42,944 50,874 
Customer deposits and prepayments43,151 48,814 
Accrued interest33,764 33,680 
Other (none of which is individually significant)42,044 37,004 
Total accrued liabilities$226,320 $244,759