Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net Margin including Non-controlling interest	$ 20,025	$ 12,166	$ 17,024
Adjustments to reconcile net margin to net cash provided by operating activities:
Depreciation and amortization	70,416	69,902	68,752
Other non-cash charges	16,886	17,121	16,951
Change in current assets	14,170	16,799	(27,530)
Change in deferred energy	(28,117)	26,660	22,521
Change in current liabilities	56,303	23,284	(23,692)
Change in regulatory assets and liabilities	72,527	33,157	(58,590)
Change in deferred charges and other assets and deferred credits and other liabilities	(24,619)	(1,432)	2,575
Net Cash Provided by Operating Activities	197,591	197,657	18,011
Investing Activities:
Purchases of held to maturity securities			(3,115)
Proceeds from sale of held to maturity securities		3,115	5,573
Purchases of available for sale securities	(15,000)	(24,800)	(53,828)
Proceeds from sale of available for sale securities	15,000	24,800	53,828
Increase in other investments	(20,105)	(12,561)	(5,636)
Electric plant additions	(29,881)	(98,395)	(36,263)
Net Cash Used for Investing Activities	(49,986)	(107,841)	(39,441)
Financing Activities:
Debt issuance costs		(235)	(257)
Payments of long-term debt	(49,041)	(40,792)	(40,792)
Draws on revolving credit facility		355,225	274,000
Repayments on revolving credit facility		(422,425)	(206,800)
Net Cash (Used for) Provided by Financing Activities	(49,041)	(108,227)	26,151
Net Change in Cash and Cash Equivalents	98,564	(18,411)	4,721
Cash and Cash Equivalents - Beginning of Period	9,288	27,699	22,978
Cash and Cash Equivalents - End of Period	$ 107,852	$ 9,288	$ 27,699