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Selected Balance Sheet Information (Tables) | 9 Months Ended
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Sep. 30, 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:
| September 30, 2021 |  | December 31, 2020
Accounts receivable, trade | $ | 120,930 |  |  | $ | 146,899 |
Unbilled revenue | 63,338 |  |  | 126,065 |
Less: Allowance for credit losses | (2,312) |  |  | (7,003) |
Accounts receivable, net | $ | 181,956 |  |  | $ | 265,961 |
Financing Receivable, Current, Allowance for Credit Loss | Changes to allowance for credit losses for the nine months ended September 30, 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 September 30,
2021 |  | $ | 7,003 |  |  |  |  | $ | 1,111 |  |  | $ | 2,420 |  |  | $ | (8,222) |  |  | $ | 2,312 |
2020 |  | $ | 2,444 |  |  |  |  | $ | 8,471 |  |  | $ | 3,720 |  |  | $ | (6,026) |  |  | $ | 8,609 |
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:
| September 30, 2021 |  | December 31, 2020
Materials and supplies | $ | 85,612 |  |  | $ | 85,250 |
Fuel - Electric Utilities | 1,240 |  |  | 1,531 |
Natural gas in storage | 58,891 |  |  | 30,619 |
Total materials, supplies and fuel | $ | 145,743 |  |  | $ | 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:
| September 30, 2021 | December 31, 2020
Accrued employee compensation, benefits and withholdings | $ | 72,328 |  | $ | 77,806 |
Accrued property taxes | 44,231 |  | 47,105 |
Customer deposits and prepayments | 53,652 |  | 52,185 |
Accrued interest | 46,532 |  | 31,520 |
Other (none of which is individually significant) | 33,092 |  | 34,996 |
Total accrued liabilities | $ | 249,835 |  | $ | 243,612 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of allowance for credit loss of financing receivable, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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