Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities:
Net Margin including Non-controlling interest	$ 11,770	$ 20,025	$ 12,166
Adjustments to reconcile net margin to net cash provided by operating activities:
Depreciation and amortization	69,167	70,416	69,902
Other non-cash charges	16,192	16,886	17,121
Change in current assets	(119,343)	14,170	16,799
Change in deferred energy	(78,831)	(28,117)	26,660
Change in current liabilities	80,459	56,303	23,284
Change in regulatory assets and liabilities	(19,453)	72,527	33,157
Change in deferred charges and other assets and deferred credits and other liabilities	(19,567)	(24,619)	(1,432)
Net Cash (Used for) Provided by Operating Activities	(59,606)	197,591	197,657
Investing Activities:
Purchases of held to maturity securities	(80,012)
Proceeds from sale of held to maturity securities	80,600		3,115
Purchases of available for sale securities		(15,000)	(24,800)
Proceeds from sale of available for sale securities		15,000	24,800
Increase in other investments	(3,491)	(20,105)	(12,561)
Electric plant additions	(31,089)	(29,881)	(98,395)
Net Cash Used for Investing Activities	(33,992)	(49,986)	(107,841)
Financing Activities:
Debt issuance costs			(235)
Payments of long-term debt	(49,041)	(49,041)	(40,792)
Draws on revolving credit facility	152,500		355,225
Repayments on revolving credit facility	(102,500)		(422,425)
Net Cash Provided by (Used for) Financing Activities	959	(49,041)	(108,227)
Net Change in Cash and Cash Equivalents	(92,639)	98,564	(18,411)
Cash and Cash Equivalents - Beginning of Period	107,852	9,288	27,699
Cash and Cash Equivalents - End of Period	$ 15,213	$ 107,852	$ 9,288