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Select Balance Sheet Information
 3 Months Ended
Mar. 31, 2021
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, 2021 and December 31, 2020 are as follows:
(in thousands)March 31,
2021		December 31,
2020
Receivables
Trade$112,060 $87,048 
Other6,982 8,939 
Unbilled Receivables18,331 21,187 
Total Receivables137,373 117,174 
Less Allowance for Credit Losses2,983 3,215 
Receivables, net of allowance for credit losses$134,390 $113,959 
The following is a summary of activity in the allowance for credit losses for the three months ended March 31, 2021 and 2020:
(in thousands)20212020
Beginning Balance, January 1$3,215 $1,339 
Additions Charged to Expense211 635 
Reductions for Amounts Written-Off, Net of Recoveries(443)(293)
Ending Balance, March 31$2,983 $1,681 
Inventories
Inventories consist of the following as of March 31, 2021 and December 31, 2020:
(in thousands)March 31,
2021		December 31,
2020
Finished Goods$20,567 $22,046 
Work in Process19,324 16,210 
Raw Material, Fuel and Supplies52,535 53,909 
Total Inventories$92,426 $92,165 
Investments
The following is a summary of our investments at March 31, 2021 and December 31, 2020:
(in thousands)March 31,
2021		December 31,
2020
Corporate-Owned Life Insurance Policies$38,205 $36,825 
Debt Securities9,209 9,260 
Money Market Funds1,862 4,075 
Mutual Funds5,141 1,662 
Other Investments29 34 
Total Investments$54,446 $51,856 
The amount of unrealized gains and losses on debt securities as of March 31, 2021 and December 31, 2020 are 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, 2021 and December 31, 2020 are not material.
Property, Plant and Equipment
Major classes of property, plant and equipment as of March 31, 2021 and December 31, 2020 include:
(in thousands)March 31,
2021		December 31,
2020
Electric Plant in Service  
Electric Plant in Service2,682,884 2,531,352 
Construction Work in Progress77,676 203,078 
Total Gross Electric Plant2,760,560 2,734,430 
Less Accumulated Depreciation and Amortization796,161 778,988 
Net Electric Plant$1,964,399 $1,955,442 
Nonelectric Property, Plant and Equipment
Nonelectric Property, Plant and Equipment in Service259,975 258,730 
Construction Work in Progress12,086 9,290 
Total Gross Nonelectric Property, Plant and Equipment272,061 268,020 
Less Accumulated Depreciation and Amortization175,668 174,189 
Net Nonelectric Property, Plant and Equipment96,393 93,831 
Net Property, Plant and Equipment$2,060,792 $2,049,273