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Select Balance Sheet Information
9 Months Ended
Sep. 30, 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 September 30, 2021 and December 31, 2020 are as follows:
(in thousands)September 30,
2021
December 31,
2020
Receivables
Trade$152,906 $87,048 
Other11,182 8,939 
Unbilled Receivables17,003 21,187 
Total Receivables181,091 117,174 
Less: Allowance for Credit Losses2,332 3,215 
Receivables, net of allowance for credit losses$178,759 $113,959 
The following is a summary of activity in the allowance for credit losses for the nine months ended September 30, 2021 and 2020:
(in thousands)20212020
Beginning Balance, January 1$3,215 $1,339 
Additions Charged to Expense177 1,845 
Reductions for Amounts Written Off, Net of Recoveries(1,060)(923)
Ending Balance, September 30$2,332 $2,261 
Inventories
Inventories consist of the following as of September 30, 2021 and December 31, 2020:
(in thousands)September 30,
2021
December 31,
2020
Finished Goods$25,727 $22,046 
Work in Process29,932 16,210 
Raw Material, Fuel and Supplies58,956 53,909 
Total Inventories$114,615 $92,165 
Investments
The following is a summary of our investments as of September 30, 2021 and December 31, 2020:
(in thousands)September 30,
2021
December 31,
2020
Corporate-Owned Life Insurance Policies$40,096 $36,825 
Debt Securities9,208 9,260 
Money Market Funds953 4,075 
Mutual Funds5,170 1,662 
Other Investments29 34 
Total Investments$55,456 $51,856 
The amount of unrealized gains and losses on debt securities as of September 30, 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 September 30, 2021 and December 31, 2020 are not material.
Property, Plant and Equipment
Major classes of property, plant and equipment as of September 30, 2021 and December 31, 2020 include:
(in thousands)September 30,
2021
December 31,
2020
Electric Plant in Service  
Electric Plant in Service$2,705,778 $2,531,352 
Construction Work in Progress100,495 203,078 
Total Gross Electric Plant2,806,273 2,734,430 
Less Accumulated Depreciation and Amortization822,441 778,988 
Net Electric Plant1,983,832 1,955,442 
Nonelectric Property, Plant and Equipment
Nonelectric Property, Plant and Equipment in Service263,880 258,730 
Construction Work in Progress15,564 9,290 
Total Gross Nonelectric Property, Plant and Equipment279,444 268,020 
Less Accumulated Depreciation and Amortization180,053 174,189 
Net Nonelectric Property, Plant and Equipment99,391 93,831 
Net Property, Plant and Equipment$2,083,223 $2,049,273