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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Inventories

Inventories consist of the following as of December 31, 2020 and 2019:

(in thousands)			2020						2019
Finished Goods			$	22,046					$	31,863
Work in Process			16,210						16,508
Raw Material, Fuel and Supplies			53,909						49,480
Total Inventories			$	92,165					$	97,851

Schedule of Investments

The following is a summary of our investments at December 31, 2020 and 2019:

(in thousands)			2020						2019
Corporate-Owned Life Insurance Policies			$	36,825					$	33,117
Debt Securities			9,260						8,184
Money Market Funds			4,075						2,363
Marketable Equity Securities			1,662						1,586
Other Investments			34						124
Total Investments			$	51,856					$	45,374

Schedule of Estimated Service Lives For Rate-Regulated and Nonelectric Assets

The estimated service lives for rate-regulated electric assets and nonelectric assets are included below:

			Service Life Range
(years)			Low						High
Electric Assets:
Production Plant			9						82
Transmission Plant			51						75
Distribution Plant			15						70
General Plant			5						55
Nonelectric Assets:
Equipment			2						12
Buildings and Leasehold Improvements			5						40

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