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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Accounting Policies [Abstract] |
Schedule of Inventories | Inventories consist of the following as of December 31, 2022 and 2021:
(in thousands) | 2022 |  | 2021
Finished Goods | $ | 43,812 |  |  | $ | 39,903 |
Work in Process | 31,766 |  |  | 35,705 |
Raw Material, Fuel and Supplies | 70,374 |  |  | 72,882 |
Total Inventories | $ | 145,952 |  |  | $ | 148,490 |
Schedule of Investments | The following is a summary of our investments at December 31, 2022 and 2021:
(in thousands) | 2022 |  | 2021
Corporate-Owned Life Insurance Policies | $ | 38,991 |  |  | $ | 41,078 |
Corporate and Government Debt Securities | 8,761 |  |  | 9,202 |
Mutual Funds | 5,503 |  |  | 5,432 |
Money Market Funds | 1,560 |  |  | 949 |
Other Investments | 30 |  |  | 29 |
Total Investments | $ | 54,845 |  |  | $ | 56,690 |
Schedule of Estimated Service Lives For Rate-Regulated and Nonelectric Assets | The estimated service lives for rate-regulated electric assets and nonelectric assets are included below:
| Service Life Range
(years) | Low |  | High
Electric Assets: |  |  |
Production Plant | 13 |  | 113
Transmission Plant | 51 |  | 75
Distribution Plant | 16 |  | 70
General Plant | 5 |  | 60
Nonelectric Assets: |  |  |
Equipment | 2 |  | 20
Buildings and Leasehold Improvements | 2 |  | 40

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