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Selected Balance Sheet Information: | 3 Months Ended
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Mar. 31, 2022
Selected Balance Sheet Information [Abstract] |
Selected Balance Sheet Information | Selected Balance Sheet Information Accounts Receivable and Allowance for Credit Losses Following is a summary of Accounts receivable, net included in the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:
| March 31, 2022 |  | December 31, 2021
Billed Accounts Receivable | $ | 257,982 |  |  | $ | 181,027 |
Unbilled Revenue | 130,294 |  |  | 142,738 |
Less: Allowance for Credit Losses | (4,486) |  |  | (2,113) |
Accounts Receivable, net | $ | 383,790 |  |  | $ | 321,652 |
Changes to allowance for credit losses for the three months ended March 31, 2022 and 2021, respectively, were as follows (in thousands):
|  | Balance at Beginning of Year |  |  |  | Additions Charged to Costs and Expenses |  | Recoveries and Other Additions |  | Write-offs and Other Deductions |  | Balance at March 31,
2022 |  | $ | 2,113 |  |  |  |  | $ | 3,416 |  |  | $ | 655 |  |  | $ | (1,698) |  |  | $ | 4,486 |
2021 |  | $ | 7,003 |  |  |  |  | $ | 1,877 |  |  | $ | 1,014 |  |  | $ | (1,643) |  |  | $ | 8,251 |
Materials, Supplies and Fuel 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, 2022 | December 31, 2021
Materials and supplies | $ | 92,224 |  | $ | 86,400 |
Fuel - Electric Utilities | 1,459 |  | 1,267 |
Natural gas in storage | 14,549 |  | 63,312 |
Total materials, supplies and fuel | $ | 108,232 |  | $ | 150,979 |
Accrued Liabilities The following amounts by major classification are included in Accrued liabilities on the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:
| March 31, 2022 | December 31, 2021
Accrued employee compensation, benefits and withholdings | $ | 51,032 |  | $ | 74,387 |
Accrued property taxes | 53,389 |  | 50,874 |
Customer deposits and prepayments | 39,543 |  | 48,814 |
Accrued interest | 46,396 |  | 33,680 |
Other (none of which is individually significant) | 36,849 |  | 37,004 |
Total accrued liabilities | $ | 227,209 |  | $ | 244,759 |

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- Definition Selected Balance Sheet Information [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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