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Selected Balance Sheet Information: | 3 Months Ended
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Mar. 31, 2021
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, 2021 |  | December 31, 2020
Accounts receivable, trade | $ | 199,548 |  |  | $ | 146,899 |
Unbilled revenue | 91,085 |  |  | 126,065 |
Less: Allowance for credit losses | (8,251) |  |  | (7,003) |
Accounts receivable, net | $ | 282,382 |  |  | $ | 265,961 |
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 Year |  |  |  | Additions Charged to Costs and Expenses |  | Recoveries and Other Additions |  | Write-offs and Other Deductions |  | Balance 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 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, 2021 |  | December 31, 2020
Materials and supplies | $ | 88,088 |  |  | $ | 85,250 |
Fuel - Electric Utilities | 1,590 |  |  | 1,531 |
Natural gas in storage | 12,925 |  |  | 30,619 |
Total materials, supplies and fuel | $ | 102,603 |  |  | $ | 117,400 |
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, 2021 | December 31, 2020
Accrued employee compensation, benefits and withholdings | $ | 57,347 |  | $ | 77,806 |
Accrued property taxes | 49,267 |  | 47,105 |
Customer deposits and prepayments | 50,194 |  | 52,185 |
Accrued interest | 45,896 |  | 31,520 |
Other (none of which is individually significant) | 27,740 |  | 34,996 |
Total accrued liabilities | $ | 230,444 |  | $ | 243,612 |

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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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