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Select Balance Sheet Information | 3 Months Ended
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Mar. 31, 2023
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, 2023 and December 31, 2022 are as follows:
(in thousands) | March 31, 2023 |  | December 31, 2022
Receivables |  |  |
Trade | $ | 145,337 |  |  | $ | 112,126 |
Other | 8,918 |  |  | 9,983 |
Unbilled Receivables | 23,378 |  |  | 23,932 |
Total Receivables | 177,633 |  |  | 146,041 |
Less: Allowance for Credit Losses | 2,191 |  |  | 1,648 |
Receivables, net of allowance for credit losses | $ | 175,442 |  |  | $ | 144,393 |
The following is a summary of activity in the allowance for credit losses for the three months ended March 31, 2023 and 2022:
(in thousands) | 2023 |  | 2022
Beginning Balance, January 1 | $ | 1,648 |  |  | $ | 1,836 |
Additions Charged to Expense | 737 |  |  | 210 |
Reductions for Amounts Written Off, Net of Recoveries | (194) |  |  | (259) |
Ending Balance, March 31 | $ | 2,191 |  |  | $ | 1,787 |
Inventories Inventories consist of the following as of March 31, 2023 and December 31, 2022:
(in thousands) | March 31, 2023 |  | December 31, 2022
Raw Material, Fuel and Supplies | $ | 73,860 |  |  | $ | 70,374 |
Work in Process | 30,602 |  |  | 31,766 |
Finished Goods | 40,305 |  |  | 43,812 |
Total Inventories | $ | 144,767 |  |  | $ | 145,952 |
Investments The following is a summary of our investments as of March 31, 2023 and December 31, 2022:
(in thousands) | March 31, 2023 |  | December 31, 2022
Corporate-Owned Life Insurance Policies | $ | 39,781 |  |  | $ | 38,991 |
Corporate and Government Debt Securities | 8,971 |  |  | 8,761 |
Money Market Funds | 2,148 |  |  | 1,560 |
Mutual Funds | 7,128 |  |  | 5,503 |
Other Investments | 30 |  |  | 30 |
Total Investments | $ | 58,058 |  |  | $ | 54,845 |
The amount of unrealized gains and losses on debt securities as of March 31, 2023 and December 31, 2022 was 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, 2023 and December 31, 2022 was not material. Property, Plant and Equipment Major classes of property, plant and equipment as of March 31, 2023 and December 31, 2022 include:
(in thousands) | March 31, 2023 |  | December 31, 2022
Electric Plant |  |  |
Electric Plant in Service | $ | 2,917,699 |  |  | $ | 2,844,379 |
Construction Work in Progress | 128,328 |  |  | 113,932 |
Total Gross Electric Plant | 3,046,027 |  |  | 2,958,311 |
Less Accumulated Depreciation and Amortization | 876,330 |  |  | 859,988 |
Net Electric Plant | 2,169,697 |  |  | 2,098,323 |
Nonelectric Property, Plant and Equipment |  |  |
Nonelectric Property, Plant and Equipment in Service | 295,548 |  |  | 293,928 |
Construction Work in Progress | 22,840 |  |  | 15,170 |
Total Gross Nonelectric Property, Plant and Equipment | 318,388 |  |  | 309,098 |
Less Accumulated Depreciation and Amortization | 198,594 |  |  | 194,704 |
Net Nonelectric Property, Plant and Equipment | 119,794 |  |  | 114,394 |
Net Property, Plant and Equipment | $ | 2,289,491 |  |  | $ | 2,212,717 |
On January 3, 2023, we purchased the Ashtabula III wind farm, located in eastern North Dakota, which consists of 39 wind turbines and the related infrastructure, adding 62.4 megawatts of nameplate capacity to our owned generation assets. The total purchase price of the acquisition was $50.6 million. In addition to the acquired assets, we also recognized a $3.3 million asset retirement obligation liability associated with the wind farm and became party to the land easement agreements with the landowners of the wind farm.

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI https://asc.fasb.org/topic&trid=2122208 + Details
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