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Select Balance Sheet Information (Tables) | 9 Months Ended
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Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Receivables | Receivables as of September 30, 2021 and December 31, 2020 are as follows:
(in thousands) | September 30, 2021 |  | December 31, 2020
Receivables |  |  |
Trade | $ | 152,906 |  |  | $ | 87,048 |
Other | 11,182 |  |  | 8,939 |
Unbilled Receivables | 17,003 |  |  | 21,187 |
Total Receivables | 181,091 |  |  | 117,174 |
Less: Allowance for Credit Losses | 2,332 |  |  | 3,215 |
Receivables, net of allowance for credit losses | $ | 178,759 |  |  | $ | 113,959 |
Summary of Activity in Allowance for Credit Losses | The following is a summary of activity in the allowance for credit losses for the nine months ended September 30, 2021 and 2020:
(in thousands) | 2021 |  | 2020
Beginning Balance, January 1 | $ | 3,215 |  |  | $ | 1,339 |
Additions Charged to Expense | 177 |  |  | 1,845 |
Reductions for Amounts Written Off, Net of Recoveries | (1,060) |  |  | (923) |
Ending Balance, September 30 | $ | 2,332 |  |  | $ | 2,261 |
Schedule of Inventories | Inventories consist of the following as of September 30, 2021 and December 31, 2020:
(in thousands) | September 30, 2021 |  | December 31, 2020
Finished Goods | $ | 25,727 |  |  | $ | 22,046 |
Work in Process | 29,932 |  |  | 16,210 |
Raw Material, Fuel and Supplies | 58,956 |  |  | 53,909 |
Total Inventories | $ | 114,615 |  |  | $ | 92,165 |
Schedule of Investments | The following is a summary of our investments as of September 30, 2021 and December 31, 2020:
(in thousands) | September 30, 2021 |  | December 31, 2020
Corporate-Owned Life Insurance Policies | $ | 40,096 |  |  | $ | 36,825 |
Debt Securities | 9,208 |  |  | 9,260 |
Money Market Funds | 953 |  |  | 4,075 |
Mutual Funds | 5,170 |  |  | 1,662 |
Other Investments | 29 |  |  | 34 |
Total Investments | $ | 55,456 |  |  | $ | 51,856 |
Schedule of Property, Plant and Equipment | Major classes of property, plant and equipment as of September 30, 2021 and December 31, 2020 include:
(in thousands) | September 30, 2021 |  | December 31, 2020
Electric Plant in Service |  |  |
Electric Plant in Service | $ | 2,705,778 |  |  | $ | 2,531,352 |
Construction Work in Progress | 100,495 |  |  | 203,078 |
Total Gross Electric Plant | 2,806,273 |  |  | 2,734,430 |
Less Accumulated Depreciation and Amortization | 822,441 |  |  | 778,988 |
Net Electric Plant | 1,983,832 |  |  | 1,955,442 |
Nonelectric Property, Plant and Equipment |  |  |
Nonelectric Property, Plant and Equipment in Service | 263,880 |  |  | 258,730 |
Construction Work in Progress | 15,564 |  |  | 9,290 |
Total Gross Nonelectric Property, Plant and Equipment | 279,444 |  |  | 268,020 |
Less Accumulated Depreciation and Amortization | 180,053 |  |  | 174,189 |
Net Nonelectric Property, Plant and Equipment | 99,391 |  |  | 93,831 |
Net Property, Plant and Equipment | $ | 2,083,223 |  |  | $ | 2,049,273 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: 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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