Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 26,329	$ 32,077
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of electric plant in service	47,772	44,429
Amortization of Nuclear Fuel	19,570	21,100
Deferred income taxes, net	4,204	15,339
Allowance for equity funds used during construction	(1,638)	(1,541)
Other amortization and accretion	10,350	9,991
Net gain on decommissioning trust funds	(593)	(7,357)
Other operating activities	11	(641)
Change in:
Accounts receivable	(23,516)	(32,684)
Inventories	1,906	(2,791)
Prepayments and other	(8,192)	(6,294)
Accounts payable	(6,405)	(1,262)
Taxes accrued	(4,460)	(4,014)
Interest accrued	279	86
Net over-collection of fuel revenues	984	2,667
Other current liabilities	10,274	3,530
Deferred charges and credits	(2,448)	(4,644)
Net cash provided by operating activities	74,427	67,991
Cash flows from investing activities:
Cash additions to utility property, plant and equipment	(117,349)	(108,113)
Cash additions to nuclear fuel	(18,930)	(20,647)
Insurance proceeds received for equipment	5,351	1,725
Capitalized interest and AFUDC:
Utility property, plant and equipment	(3,308)	(3,043)
Nuclear fuel and other	(2,579)	(2,638)
Allowance for equity funds used during construction	1,638	1,541
Decommissioning trust funds:
Purchases, including funding of $1.1 million and $2.3 million, respectively	(47,896)	(65,960)
Sales and maturities	44,933	62,531
Other investing activities	2,134	(928)
Net cash used for investing activities	(136,006)	(135,532)
Cash flows from financing activities:
Dividends paid	(28,257)	(26,157)
Borrowings under the revolving credit facility:
Proceeds	419,559	292,404
Payments	(512,647)	(195,094)
Other financing activities	(2,143)	(757)
Net cash provided by financing activities	66,512	70,396
Net increase in cash and cash equivalents	4,933	2,855
Cash and cash equivalents at beginning of period	6,990	8,420
Cash and cash equivalents at end of period	11,923	11,275
4.22% Senior Notes, due 2028
Cash flows from financing activities:
Proceeds from issuance of senior notes	125,000	0
4.07% RGRT Senior Notes, due 2025
Cash flows from financing activities:
Proceeds from issuance of senior notes	$ 65,000	$ 0