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Select Balance Sheet Information
 6 Months Ended
Jun. 30, 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 June 30, 2024 and December 31, 2023 are as follows:
(in thousands)June 30,
2024		December 31,
2023
Receivables
Trade$164,098 $129,257 
Other9,725 9,084 
Unbilled Receivables20,149 21,324 
Total Receivables193,972 159,665 
Less: Allowance for Credit Losses2,026 2,522 
Receivables, net of allowance for credit losses$191,946 $157,143 
The following is a summary of activity in the allowance for credit losses for the six months ended June 30, 2024 and 2023:
(in thousands)20242023
Beginning Balance, January 1$2,522 $1,648 
Additions Charged to Expense471 1,001 
Reductions for Amounts Written Off, Net of Recoveries(967)(435)
Ending Balance, June 30
$2,026 $2,214 
Inventories
Inventories consist of the following as of June 30, 2024 and December 31, 2023:
(in thousands)June 30,
2024		December 31,
2023
Raw Material, Fuel and Supplies$85,795 $75,733 
Work in Process27,435 26,354 
Finished Goods48,557 47,614 
Total Inventories$161,787 $149,701 
Investments
The following is a summary of our investments as of June 30, 2024 and December 31, 2023:
(in thousands)June 30,
2024		December 31,
2023
Short-term Investments
Government Debt Securities
$469 $— 
Corporate Debt Securities
590 — 
Total Short-term Investments
$1,059 $— 
Long-term Investments
Corporate-Owned Life Insurance Policies$44,534 $42,287 
Government Debt Securities
58,749 7,724 
Corporate Debt Securities
1,025 1,579 
Money Market Funds2,606 3,125 
Mutual Funds10,121 7,771 
Other Investments27 30 
Total Long-term Investments
117,062 62,516 
Total Investments$118,121 $62,516 
The amount of unrealized gains and losses on debt securities as of June 30, 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 June 30, 2024 and December 31, 2023 was not material.
Property, Plant and Equipment
Major classes of property, plant and equipment as of June 30, 2024 and December 31, 2023 include:
(in thousands)June 30,
2024		December 31,
2023
Electric Plant  
Electric Plant in Service$3,055,265 $2,989,881 
Construction Work in Progress199,338 137,212 
Total Gross Electric Plant3,254,603 3,127,093 
Less Accumulated Depreciation and Amortization879,268 851,148 
Net Electric Plant2,375,335 2,275,945 
Nonelectric Property, Plant and Equipment
Nonelectric Property, Plant and Equipment in Service325,067 311,924 
Construction Work in Progress54,054 38,062 
Total Gross Nonelectric Property, Plant and Equipment379,121 349,986 
Less Accumulated Depreciation and Amortization215,615 207,556 
Net Nonelectric Property, Plant and Equipment163,506 142,430 
Net Property, Plant and Equipment$2,538,841 $2,418,375