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Selected Balance Sheet Information (Tables)
 3 Months Ended
Mar. 31, 2021
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:
March 31, 2021December 31, 2020
Accounts receivable, trade$199,548 $146,899 
Unbilled revenue91,085 126,065 
Less: Allowance for credit losses(8,251)(7,003)
Accounts receivable, net$282,382 $265,961 
Financing Receivable, Current, Allowance for Credit Loss
Changes to allowance for credit losses for the three months ended March 31, 2021 and 2020, respectively, were as follows (in thousands):

Balance at Beginning of YearAdditions Charged to Costs and ExpensesRecoveries and Other AdditionsWrite-offs and Other DeductionsBalance at March 31,
2021$7,003 $1,877 $1,014 $(1,643)$8,251 
2020$2,444 $3,519 $922 $(1,723)$5,162 
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:
March 31, 2021December 31, 2020
Materials and supplies$88,088 $85,250 
Fuel - Electric Utilities1,590 1,531 
Natural gas in storage12,925 30,619 
Total materials, supplies and fuel$102,603 $117,400 
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:
March 31, 2021December 31, 2020
Accrued employee compensation, benefits and withholdings$57,347 $77,806 
Accrued property taxes49,267 47,105 
Customer deposits and prepayments50,194 52,185 
Accrued interest45,896 31,520 
Other (none of which is individually significant)27,740 34,996 
Total accrued liabilities$230,444 $243,612