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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Inventories | Inventories consist of the following as of December 31, 2021 and 2020:
(in thousands) | 2021 |  | 2020
Finished Goods | $ | 39,903 |  |  | $ | 22,046 |
Work in Process | 35,705 |  |  | 16,210 |
Raw Material, Fuel and Supplies | 72,882 |  |  | 53,909 |
Total Inventories | $ | 148,490 |  |  | $ | 92,165 |
Schedule of Investments | The following is a summary of our investments at December 31, 2021 and 2020:
(in thousands) | 2021 |  | 2020
Corporate-Owned Life Insurance Policies | $ | 41,078 |  |  | $ | 36,825 |
Corporate and Government Debt Securities | 9,202 |  |  | 9,260 |
Mutual Funds | 5,432 |  |  | 1,662 |
Money Market Funds | 949 |  |  | 4,075 |
Other Investments | 29 |  |  | 34 |
Total Investments | $ | 56,690 |  |  | $ | 51,856 |
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 | 9 |  | 83
Transmission Plant | 51 |  | 75
Distribution Plant | 16 |  | 70
General Plant | 5 |  | 60
Nonelectric Assets: |  |  |
Equipment | 2 |  | 12
Buildings and Leasehold Improvements | 5 |  | 40

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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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