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Selected Balance Sheet Information: | 9 Months Ended
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Sep. 30, 2020
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:
| September 30, 2020 |  | December 31, 2019
Accounts receivable, trade | $ | 108,351 |  |  | $ | 144,747 |
Unbilled revenue | 60,736 |  |  | 113,502 |
Less: Allowance for credit losses | (8,609) |  |  | (2,444) |
Accounts receivable, net | $ | 160,478 |  |  | $ | 255,805 |
Changes to allowance for credit losses for the nine months ended September 30, 2020 and 2019, 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 September 30,
2020 |  | $ | 2,444 |  |  |  |  | $ | 8,471 |  | (a) | $ | 3,720 |  |  | $ | (6,026) |  |  | $ | 8,609 |
2019 |  | $ | 3,209 |  |  |  |  | $ | 5,637 |  |  | $ | 2,742 |  |  | $ | (8,429) |  |  | $ | 3,159 |
__________ (a) Due to the COVID-19 pandemic, all of our jurisdictions temporarily suspended disconnections for a period of time, which increased our accounts receivable arrears balances. As a result, we increased our allowance for credit losses and bad debt expense for the nine months ended September 30, 2020 by an incremental $3.7 million. The ongoing credit evaluation of our customers during the COVID-19 pandemic is further discussed in the Credit Risk section of Note 9. 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:
| September 30, 2020 |  | December 31, 2019
Materials and supplies | $ | 93,069 |  |  | $ | 82,809 |
Fuel - Electric Utilities | 1,745 |  |  | 2,425 |
Natural gas in storage | 31,544 |  |  | 31,938 |
Total materials, supplies and fuel | $ | 126,358 |  |  | $ | 117,172 |
Accrued Liabilities The following amounts by major classification are included in Accrued liabilities on the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:
| September 30, 2020 | December 31, 2019
Accrued employee compensation, benefits and withholdings | $ | 65,309 |  | $ | 62,837 |
Accrued property taxes | 40,624 |  | 44,547 |
Customer deposits and prepayments | 59,510 |  | 54,728 |
Accrued interest | 46,044 |  | 31,868 |
Other (none of which is individually significant) | 32,523 |  | 32,787 |
Total accrued liabilities | $ | 244,010 |  | $ | 226,767 |

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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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