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Select Balance Sheet Information | 3 Months Ended
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Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Select Balance Sheet Information | Select Balance Sheet Information Receivables and Allowance for Credit Losses Receivables as of March 31, 2021 and December 31, 2020 are as follows:
(in thousands) | March 31, 2021 |  | December 31, 2020
Receivables |  |  |
Trade | $ | 112,060 |  |  | $ | 87,048 |
Other | 6,982 |  |  | 8,939 |
Unbilled Receivables | 18,331 |  |  | 21,187 |
Total Receivables | 137,373 |  |  | 117,174 |
Less Allowance for Credit Losses | 2,983 |  |  | 3,215 |
Receivables, net of allowance for credit losses | $ | 134,390 |  |  | $ | 113,959 |
The following is a summary of activity in the allowance for credit losses for the three months ended March 31, 2021 and 2020:
(in thousands) | 2021 |  | 2020
Beginning Balance, January 1 | $ | 3,215 |  |  | $ | 1,339 |
Additions Charged to Expense | 211 |  |  | 635 |
Reductions for Amounts Written-Off, Net of Recoveries | (443) |  |  | (293) |
Ending Balance, March 31 | $ | 2,983 |  |  | $ | 1,681 |
Inventories Inventories consist of the following as of March 31, 2021 and December 31, 2020:
(in thousands) | March 31, 2021 |  | December 31, 2020
Finished Goods | $ | 20,567 |  |  | $ | 22,046 |
Work in Process | 19,324 |  |  | 16,210 |
Raw Material, Fuel and Supplies | 52,535 |  |  | 53,909 |
Total Inventories | $ | 92,426 |  |  | $ | 92,165 |
Investments The following is a summary of our investments at March 31, 2021 and December 31, 2020:
(in thousands) | March 31, 2021 |  | December 31, 2020
Corporate-Owned Life Insurance Policies | $ | 38,205 |  |  | $ | 36,825 |
Debt Securities | 9,209 |  |  | 9,260 |
Money Market Funds | 1,862 |  |  | 4,075 |
Mutual Funds | 5,141 |  |  | 1,662 |
Other Investments | 29 |  |  | 34 |
Total Investments | $ | 54,446 |  |  | $ | 51,856 |
The amount of unrealized gains and losses on debt securities as of March 31, 2021 and December 31, 2020 are not material and no unrealized losses were deemed to be other-than-temporary. In addition, the amount of unrealized gains and losses on marketable equity securities still held as of March 31, 2021 and December 31, 2020 are not material. Property, Plant and Equipment Major classes of property, plant and equipment as of March 31, 2021 and December 31, 2020 include:
(in thousands) | March 31, 2021 |  | December 31, 2020
Electric Plant in Service |  |  |
Electric Plant in Service | 2,682,884 |  |  | 2,531,352 |
Construction Work in Progress | 77,676 |  |  | 203,078 |
Total Gross Electric Plant | 2,760,560 |  |  | 2,734,430 |
Less Accumulated Depreciation and Amortization | 796,161 |  |  | 778,988 |
Net Electric Plant | $ | 1,964,399 |  |  | $ | 1,955,442 |
Nonelectric Property, Plant and Equipment |  |  |
Nonelectric Property, Plant and Equipment in Service | 259,975 |  |  | 258,730 |
Construction Work in Progress | 12,086 |  |  | 9,290 |
Total Gross Nonelectric Property, Plant and Equipment | 272,061 |  |  | 268,020 |
Less Accumulated Depreciation and Amortization | 175,668 |  |  | 174,189 |
Net Nonelectric Property, Plant and Equipment | 96,393 |  |  | 93,831 |
Net Property, Plant and Equipment | $ | 2,060,792 |  |  | $ | 2,049,273 |

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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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