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Select Balance Sheet Information
 3 Months Ended
Mar. 31, 2024
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, 2024 and December 31, 2023 are as follows:
(in thousands)March 31,
2024		December 31,
2023
Receivables
Trade$165,717 $129,257 
Other8,909 9,084 
Unbilled Receivables23,066 21,324 
Total Receivables197,692 159,665 
Less: Allowance for Credit Losses2,018 2,522 
Receivables, net of allowance for credit losses$195,674 $157,143 
The following is a summary of activity in the allowance for credit losses for the three months ended March 31, 2024 and 2023:
Three Months Ended March 31,
(in thousands)20242023
Beginning Balance, January 1$2,522 $1,648 
Additions Charged to Expense272 737 
Reductions for Amounts Written Off, Net of Recoveries(776)(194)
Ending Balance, March 31
$2,018 $2,191 
Inventories
Inventories consist of the following as of March 31, 2024 and December 31, 2023:
(in thousands)March 31,
2024		December 31,
2023
Raw Material, Fuel and Supplies$75,058 $75,733 
Work in Process28,621 26,354 
Finished Goods44,515 47,614 
Total Inventories$148,194 $149,701 
Investments
The following is a summary of our investments as of March 31, 2024 and December 31, 2023:
(in thousands)March 31,
2024		December 31,
2023
Short-term Investments
Corporate and Government Debt Securities$467 $— 
Long-term Investments
Corporate-Owned Life Insurance Policies43,980 42,287 
Corporate and Government Debt Securities9,035 9,303 
Money Market Funds3,337 3,125 
Mutual Funds9,728 7,771 
Other Investments30 30 
Total Long-term Investments
66,110 62,516 
Total Investments$66,577 $62,516 
The amount of unrealized gains and losses on debt securities as of March 31, 2024 and December 31, 2023 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, 2024 and December 31, 2023 was not material.
Property, Plant and Equipment
Major classes of property, plant and equipment as of March 31, 2024 and December 31, 2023 include:
(in thousands)March 31,
2024		December 31,
2023
Electric Plant  
Electric Plant in Service$3,030,848 $2,989,881 
Construction Work in Progress143,505 137,212 
Total Gross Electric Plant3,174,353 3,127,093 
Less Accumulated Depreciation and Amortization864,826 851,148 
Net Electric Plant2,309,527 2,275,945 
Nonelectric Property, Plant and Equipment
Nonelectric Property, Plant and Equipment in Service322,912 311,924 
Construction Work in Progress38,237 38,062 
Total Gross Nonelectric Property, Plant and Equipment361,149 349,986 
Less Accumulated Depreciation and Amortization211,487 207,556 
Net Nonelectric Property, Plant and Equipment149,662 142,430 
Net Property, Plant and Equipment$2,459,189 $2,418,375