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Select Balance Sheet Information (Tables)
 3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Receivables
Receivables as of March 31, 2025 and December 31, 2024 are as follows:
(in thousands)March 31,
2025		December 31,
2024
Receivables
Trade$152,719 $112,169 
Other11,553 13,799 
Unbilled Receivables21,970 21,916 
Total Receivables186,242 147,884 
Less: Allowance for Credit Losses2,191 1,920 
Receivables, net of allowance for credit losses$184,051 $145,964 
Schedule of Activity in Allowance for Credit Losses
The following is a summary of activity in the allowance for credit losses for the three months ended March 31, 2025 and 2024:
Three Months Ended March 31,
(in thousands)20252024
Beginning Balance, January 1$1,920 $2,522 
Additions Charged to Expense475 272 
Reductions for Amounts Written Off, Net of Recoveries(204)(776)
Ending Balance, March 31
$2,191 $2,018 
Schedule of Inventories
Inventories consist of the following as of March 31, 2025 and December 31, 2024:
(in thousands)March 31,
2025		December 31,
2024
Raw Material, Fuel and Supplies$39,541 $43,345 
Work in Process22,266 22,637 
Finished Goods85,888 82,903 
Total Inventories$147,695 $148,885 
Schedule of Investments
The following is a summary of our investments as of March 31, 2025 and December 31, 2024:
(in thousands)March 31,
2025		December 31,
2024
Short-term Investments
Government Debt Securities
$274 $753 
Long-term Investments
Corporate-Owned Life Insurance Policies47,102 47,895 
Government Debt Securities
61,692 60,378 
Corporate Debt Securities
1,647 1,628 
Money Market Funds468 596 
Mutual Funds14,177 10,653 
Other Investments27 27 
Total Long-term Investments
125,113 121,177 
Total Investments$125,387 $121,930 
Schedule of Amortized Costs and Fair Value of Debt Securities, Available-for-Sale The following table summarizes the amortized cost and fair value of available-for-sale debt securities and the corresponding amounts of gross unrealized gains and losses as of March 31, 2025 and December 31, 2024:
March 31, 2025
(in thousands)
Amortized Cost
Gross Unrealized Gains
Gross Unrealized (Losses)
Fair Value
Government Debt Securities$61,455 $637 $(126)$61,966 
Corporate Debt Securities1,637 15 (5)1,647 
Total
$63,092 $652 $(131)$63,613 
December 31, 2024
(in thousands)
Amortized Cost
Gross Unrealized Gains
Gross Unrealized (Losses)
Fair Value
Government Debt Securities$60,891 $424 $(184)$61,131 
Corporate Debt Securities1,629 9 (10)1,628 
Total
$62,520 $433 $(194)$62,759 
Schedule of Investments Classified by Contractual Maturity Date
The following table summarizes the fair value of available-for-sale debt securities by contractual maturity date as of March 31, 2025:
(in thousands)March 31, 2025
Due in one year or less
$274 
Due in one to five years
63,339 
Total$63,613 
Schedule of Property, Plant and Equipment
Major classes of property, plant and equipment as of March 31, 2025 and December 31, 2024 include:
(in thousands)March 31,
2025		December 31,
2024
Electric Plant  
Electric Plant in Service$3,214,984 $3,180,943 
Construction Work in Progress227,419 231,890 
Total Gross Electric Plant3,442,403 3,412,833 
Less Accumulated Depreciation and Amortization911,470 899,049 
Net Electric Plant2,530,933 2,513,784 
Nonelectric Property, Plant and Equipment
Nonelectric Property, Plant and Equipment in Service392,580 362,565 
Construction Work in Progress15,830 40,536 
Total Gross Nonelectric Property, Plant and Equipment408,410 403,101 
Less Accumulated Depreciation and Amortization230,032 224,425 
Net Nonelectric Property, Plant and Equipment178,378 178,676 
Net Property, Plant and Equipment$2,709,311 $2,692,460