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Select Balance Sheet Information (Tables)
 9 Months Ended
Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Receivables
Receivables as of September 30, 2024 and December 31, 2023 are as follows:
(in thousands)September 30,
2024		December 31,
2023
Receivables
Trade$160,476 $129,257 
Other8,862 9,084 
Unbilled Receivables18,885 21,324 
Total Receivables188,223 159,665 
Less: Allowance for Credit Losses1,950 2,522 
Receivables, net of allowance for credit losses$186,273 $157,143 
Schedule 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, 2024 and 2023:
(in thousands)20242023
Beginning Balance, January 1$2,522 $1,648 
Additions Charged to Expense904 1,176 
Reductions for Amounts Written Off, Net of Recoveries(1,476)(837)
Ending Balance, September 30
$1,950 $1,987 
Schedule of Inventories
Inventories consist of the following as of September 30, 2024 and December 31, 2023:
(in thousands)September 30,
2024		December 31,
2023
Raw Material, Fuel and Supplies$83,668 $75,733 
Work in Process24,904 26,354 
Finished Goods44,661 47,614 
Total Inventories$153,233 $149,701 
Schedule of Investments
The following is a summary of our investments as of September 30, 2024 and December 31, 2023:
(in thousands)September 30,
2024		December 31,
2023
Short-term Investments
Government Debt Securities
$616 $— 
Total Short-term Investments
616 — 
Long-term Investments
Corporate-Owned Life Insurance Policies46,585 42,287 
Government Debt Securities
60,776 7,724 
Corporate Debt Securities
1,644 1,579 
Money Market Funds1,118 3,125 
Mutual Funds11,271 7,771 
Other Investments27 30 
Total Long-term Investments
121,421 62,516 
Total Investments$122,037 $62,516 
Schedule of Amortized Costs and Fair Value of Debt Securities, Available-for-Sale The following table summarizes the amortized cost and fair value of debt securities available-for-sale and the corresponding amounts of gross unrealized gains and losses as of September 30, 2024:
September 30, 2024
(in thousands)
Amortized Cost
Gross Unrealized Gains
Gross Unrealized (Losses)
Fair Value
Government Debt Securities$60,399 $1,151 $(158)$61,392 
Corporate Debt Securities1,621 25 (2)1,644 
Total
$62,020 $1,176 $(160)$63,036 
Schedule of Property, Plant and Equipment
Major classes of property, plant and equipment as of September 30, 2024 and December 31, 2023 include:
(in thousands)September 30,
2024		December 31,
2023
Electric Plant  
Electric Plant in Service$3,087,286 $2,989,881 
Construction Work in Progress231,429 137,212 
Total Gross Electric Plant3,318,715 3,127,093 
Less Accumulated Depreciation and Amortization885,075 851,148 
Net Electric Plant2,433,640 2,275,945 
Nonelectric Property, Plant and Equipment
Nonelectric Property, Plant and Equipment in Service329,126 311,924 
Construction Work in Progress62,581 38,062 
Total Gross Nonelectric Property, Plant and Equipment391,707 349,986 
Less Accumulated Depreciation and Amortization220,478 207,556 
Net Nonelectric Property, Plant and Equipment171,229 142,430 
Net Property, Plant and Equipment$2,604,869 $2,418,375